The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A223646

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Number of (n+2)X2 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
(history; published version)

#4 by R. H. Hardin at Mon Mar 25 07:27:36 EDT 2013

STATUS

editing

approved

#3 by R. H. Hardin at Mon Mar 25 07:27:32 EDT 2013

LINKS

R. H. Hardin, <a href="/A223646/b223646.txt">Table of n, a(n) for n = 1..45</a>

#2 by R. H. Hardin at Mon Mar 25 07:27:20 EDT 2013

NAME

allocated for R. H. Hardin

Number of (n+2)X2 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative

DATA

9, 25, 169, 729, 3600, 14161, 63001, 227529, 1002001, 4044121, 16273156, 62425801, 265755204, 1044840976, 4209284641, 16964020516, 67776915600, 271492060401, 1096068706489, 4316558882689, 17448715791556, 70160140107225

OFFSET

1,1

COMMENTS

Column 2 of A223652

EXAMPLE

Some solutions for n=3

..1..1....1..0....1..1....1..1....1..1....1..0....1..1....1..0....1..1....1..1

..1..0....0..1....1..0....0..0....0..0....0..0....0..0....0..0....0..0....1..0

..1..0....0..0....0..1....0..0....0..1....1..0....0..0....0..0....1..0....0..1

..0..0....0..0....1..0....0..0....1..1....1..0....1..0....1..0....1..1....1..1

..1..1....0..1....1..1....1..0....1..1....1..1....1..0....1..1....1..1....1..1

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin Mar 25 2013

STATUS

approved

editing

#1 by R. H. Hardin at Mon Mar 25 07:20:29 EDT 2013

NAME

allocated for R. H. Hardin

KEYWORD

allocated

STATUS

approved