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A186479 Number of (n+1)X7 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors 1
5955, 8223, 21760, 67714, 108025, 305089, 418177, 1286113, 1812049, 5368065, 8100785, 22640045, 36286649, 96020681, 161275017, 408409609, 713044957, 1742523169, 3140266657, 7453942513, 13786320241, 31954929709, 60372875257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A186482

LINKS

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

FORMULA

Empirical: a(n)=2*a(n-1)+2*a(n-2)-6*a(n-3)+6*a(n-4)-3*a(n-5) for n>17

EXAMPLE

Some solutions for 3X7

..2..0..0..0..2..0..0....3..1..0..2..0..1..0....1..1..0..2..0..2..0

..3..0..0..0..0..2..0....2..0..1..0..2..0..1....1..0..1..0..2..0..2

..0..3..0..0..0..0..2....0..2..0..1..0..2..0....0..1..0..1..0..2..3

CROSSREFS

Sequence in context: A133598 A028517 A289515 * A266038 A032658 A157666

Adjacent sequences:  A186476 A186477 A186478 * A186480 A186481 A186482

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2011

STATUS

approved

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Last modified October 23 03:21 EDT 2019. Contains 328335 sequences. (Running on oeis4.)