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A230736
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Number of (n+3)X(2+3) 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero
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1
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8, 66, 244, 2016, 6576, 54138, 173428, 1427040, 4558536, 37506738, 119758148, 985334832, 3145930352, 25883741898, 82639468964, 679931791152, 2170826159272, 17860880147874, 57024624645332, 469180811419968, 1497958570841456
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OFFSET
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1,1
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COMMENTS
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Column 2 of A230739
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 31*a(n-2) -126*a(n-4) +42*a(n-6) +79*a(n-8) -a(n-10) +8*a(n-12)
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EXAMPLE
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Some solutions for n=3
..x..0..x..0..x....x..0..x..1..x....x..0..x..2..x....x..0..x..0..x
..2..x..1..x..1....1..x..2..x..0....2..x..1..x..0....2..x..1..x..2
..x..1..x..2..x....x..2..x..1..x....x..1..x..1..x....x..2..x..2..x
..0..x..0..x..1....1..x..0..x..0....0..x..2..x..0....0..x..0..x..1
..x..0..x..2..x....x..2..x..2..x....x..0..x..2..x....x..1..x..0..x
..2..x..1..x..1....1..x..1..x..1....2..x..1..x..1....0..x..2..x..2
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CROSSREFS
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Sequence in context: A015496 A226126 A039329 * A008893 A168302 A121782
Adjacent sequences: A230733 A230734 A230735 * A230737 A230738 A230739
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Oct 28 2013
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STATUS
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approved
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