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A186563 Number of (n+2)X6 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock 1
6594, 1411, 3421, 8983, 11557, 12895, 14845, 18415, 25381, 40279, 63565, 102591, 161381, 244087, 372205, 569647, 861493, 1322215, 2039165, 3110335, 4775493, 7347991, 11212621, 17186671, 26409301, 40358535, 61856925, 94997471, 145320485 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A186568

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

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>12

EXAMPLE

Some solutions for 4X6

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

..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0

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

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

CROSSREFS

Sequence in context: A145050 A256837 A216177 * A252637 A164971 A214434

Adjacent sequences:  A186560 A186561 A186562 * A186564 A186565 A186566

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 23 2011

STATUS

approved

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Last modified January 17 16:33 EST 2018. Contains 297822 sequences.