A186580 - OEIS

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A186580

Number of (n+3)X(n+3) 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock

43046721, 827, 5879, 163723, 569947, 811795, 855715, 1049539, 1464331, 2211763, 3510715, 6188179, 16060459, 36931171, 74101531, 139265491, 305505067, 600286819, 1098007483

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OFFSET

1,1

COMMENTS

Diagonal of A186589

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

Some solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A187963 A028520 A288843 * A186589 A186581 A017084

Adjacent sequences: A186577 A186578 A186579 * A186581 A186582 A186583

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2011

STATUS

approved