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A184370
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1/3 the number of (n+1)X4 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically
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1
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1107, 49235, 2167173, 95528423, 4210059673, 185547841629, 8177524177277, 360402692568245, 15883791500540967, 700035935394350709, 30852225032929689819, 1359729896274471875219, 59926484677950059719491
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OFFSET
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1,1
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COMMENTS
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Column 3 of A184376
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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)=38*a(n-1)+302*a(n-2)-1368*a(n-3)-6770*a(n-4)+12666*a(n-5)-575*a(n-6)-5790*a(n-7)+828*a(n-8)+648*a(n-9)
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EXAMPLE
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Some solutions for 3X4 with a(1,1)=0
..0..0..0..2....0..1..1..1....0..1..0..1....0..0..2..1....0..1..1..1
..1..2..2..2....0..1..1..0....0..1..0..1....1..0..2..1....2..1..2..0
..0..2..2..0....2..2..2..2....1..1..0..0....1..1..2..1....0..0..0..0
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CROSSREFS
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Sequence in context: A180296 A157376 A185501 * A172638 A172739 A172815
Adjacent sequences: A184367 A184368 A184369 * A184371 A184372 A184373
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 12 2011
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STATUS
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approved
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