The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A198910

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A198910

Number of nX4 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor
(history; published version)

#5 by Russ Cox at Sat Mar 31 12:36:35 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Oct 31 2011

Discussion

Sat Mar 31

12:36

OEIS Server: https://oeis.org/edit/global/875

#4 by Ron Hardin at Mon Oct 31 04:48:37 EDT 2011

STATUS

editing

approved

#3 by Ron Hardin at Mon Oct 31 04:48:34 EDT 2011

LINKS

R. H. Hardin, <a href="/A198910/b198910.txt">Table of n, a(n) for n = 1..123</a>

#2 by Ron Hardin at Mon Oct 31 04:48:15 EDT 2011

NAME

allocated for Ron HardinNumber of nX4 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor

DATA

5, 500, 269940, 319608038, 481871809749, 769126451071174, 1243368053336112649, 2015791720035206825303, 3270193421121063659774745, 5305976942994216714747844079, 8609380449975858170849466245738

OFFSET

1,1

COMMENTS

Column 4 of A198914

FORMULA

Empirical: a(n) = 2296*a(n-1) -1239092*a(n-2) +252277904*a(n-3) -24632440060*a(n-4) +1347961370754*a(n-5) -44994493075469*a(n-6) +960046624478492*a(n-7) -13429762946315149*a(n-8) +124540876930445980*a(n-9) -765040702294085198*a(n-10) +3074302608489782520*a(n-11) -7884335188124038674*a(n-12) +12438514719451024794*a(n-13) -11471383995777540513*a(n-14) +5595786642970619820*a(n-15) -1099871574411268404*a(n-16)

EXAMPLE

Some solutions with values 0 to 7 for n=3

..0..1..2..3....0..1..0..2....0..1..2..3....0..1..2..1....0..1..0..2

..3..4..5..2....3..4..5..3....4..5..0..6....3..4..5..6....2..0..3..4

..6..7..1..6....6..1..7..2....2..7..6..5....4..7..0..7....3..5..6..7

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Oct 31 2011

STATUS

approved

editing

#1 by Ron Hardin at Mon Oct 31 04:44:27 EDT 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved