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A186566 Number of (n+2)X9 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock 1
29303, 4033, 6511, 14845, 27391, 36133, 47719, 60973, 82447, 122725, 185863, 278125, 425791, 645685, 993687, 1533053, 2343151, 3593989, 5522887, 8433037, 12920671, 19843157, 30348343, 46510173, 71399503, 109274533, 167438119 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A186568

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..181

FORMULA

Empirical: a(n)=2*a(n-1)-a(n-2)+2*a(n-3)-4*a(n-4)+2*a(n-5)+2*a(n-6)-2*a(n-7) for n>15

EXAMPLE

Some solutions for 4X9

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

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

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

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

CROSSREFS

Sequence in context: A194619 A058652 A250940 * A083740 A083739 A329538

Adjacent sequences:  A186563 A186564 A186565 * A186567 A186568 A186569

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 23 2011

STATUS

approved

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Last modified December 3 19:39 EST 2021. Contains 349468 sequences. (Running on oeis4.)