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A186880
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Number of (n+2)X10 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock
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1
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322910, 25381, 46624, 148048, 310528, 414184, 571984, 801208, 1130584, 1842208, 3014488, 4813744, 8147608, 13457800, 21637048, 37154419, 62117614, 101085745, 172069837, 287321977, 469126669, 793531357, 1325629774, 2174290240
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OFFSET
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1,1
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COMMENTS
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Column 8 of A186881
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..200
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FORMULA
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Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-3)-6*a(n-4)+3*a(n-5)+3*a(n-6)-3*a(n-7) for n>16
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EXAMPLE
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Some solutions for 4X10
..0..0..3..0..0..0..0..0..0..1....0..0..0..0..0..0..0..0..3..0
..1..0..0..3..0..0..0..0..0..1....0..0..0..0..0..0..0..0..0..0
..0..1..0..0..3..0..0..0..0..1....2..0..0..0..0..0..0..0..0..0
..0..0..1..0..0..3..0..0..0..1....3..3..0..0..0..0..0..0..0..2
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CROSSREFS
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Sequence in context: A210317 A205931 A097937 * A114667 A186836 A015360
Adjacent sequences: A186877 A186878 A186879 * A186881 A186882 A186883
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Feb 28 2011
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STATUS
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approved
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