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A184472
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1/6 the number of (n+2)X6 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last
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1
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12339, 19119, 30681, 53739, 127689, 322275, 878625, 2967411, 9800745, 32238603, 121975089, 436928547, 1519783929, 5949509979, 21894837441, 77688357939, 307915900809, 1145251722315, 4096740213585, 16319916055011, 60974970119385
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n)=6*a(n-1)-11*a(n-2)+129*a(n-3)-738*a(n-4)+1353*a(n-5)-6290*a(n-6)+33312*a(n-7)-61072*a(n-8)+155640*a(n-9)-733968*a(n-10)+1345608*a(n-11)-2177568*a(n-12)+8661600*a(n-13)-15879600*a(n-14)+18027792*a(n-15)-56197152*a(n-16)+103028112*a(n-17)-89177760*a(n-18)+197883648*a(n-19)-362786688*a(n-20)+256296960*a(n-21)-350479872*a(n-22)+642546432*a(n-23)-390790656*a(n-24)+241864704*a(n-25)-443418624*a(n-26)+241864704*a(n-27)
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EXAMPLE
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Some solutions with a(1,1)=0 for 4X6
..0..2..1..1..2..2....0..2..1..0..2..0....0..1..1..0..1..0....0..0..2..0..2..1
..0..2..0..1..2..1....0..0..2..0..0..2....1..2..0..1..0..1....0..2..2..1..0..1
..0..2..2..1..2..0....2..2..0..2..2..1....1..0..0..1..2..0....1..0..2..0..0..1
..0..2..1..1..2..2....0..2..1..0..2..0....1..0..1..1..0..0....0..0..2..0..2..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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