The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A221404

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Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two
(history; published version)

#7 by R. H. Hardin at Tue Jan 15 07:32:21 EST 2013

STATUS

editing

approved

#6 by R. H. Hardin at Tue Jan 15 07:32:09 EST 2013

EXAMPLE

Some solutions for n=4

..0..2..0....2..0..2....2..0..2....0..2..0....0..2..0....2..0..0....0..2..2

..2..0..0....2..0..0....0..0..2....0..0..2....0..2..0....0..2..2....0..0..0

..2..2..2....0..0..2....0..0..2....2..2..2....2..0..2....0..0..0....2..0..2

..0..2..0....2..2..0....2..0..2....0..0..2....2..0..2....2..2..2....2..2..0

STATUS

approved

editing

#5 by R. H. Hardin at Tue Jan 15 07:26:18 EST 2013

STATUS

editing

approved

#4 by R. H. Hardin at Tue Jan 15 07:26:15 EST 2013

LINKS

R. H. Hardin, <a href="/A221404/b221404.txt">Table of n, a(n) for n = 1..210</a>

#3 by R. H. Hardin at Tue Jan 15 07:26:00 EST 2013

NAME

allocated for R. H. Hardin

Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two

DATA

0, 16, 0, 436, 0, 12668, 0, 368268, 0, 10705360, 0, 311197280, 0, 9046269888, 0, 262968117056, 0, 7644280337936, 0, 222213327464336, 0, 6459569820912704, 0, 187774705858714240, 0, 5458465675503960896, 0, 158673381440822516672, 0

OFFSET

1,2

COMMENTS

Column 3 of A221408

FORMULA

Empirical: a(n) = 36*a(n-2) -200*a(n-4) -40*a(n-6) -84*a(n-8) +80*a(n-10) -20*a(n-12) +80*a(n-14)

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin Jan 15 2013

STATUS

approved

editing

#2 by R. H. Hardin at Tue Jan 15 07:24:51 EST 2013

KEYWORD

allocating

allocated

#1 by R. H. Hardin at Tue Jan 15 07:24:51 EST 2013

NAME

allocated for R. H. Hardin

KEYWORD

allocating

STATUS

approved