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A205469
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Number of (n+1)X3 0..2 arrays with every 2X2 subblock having the same number of equal edges, and new values 0..2 introduced in row major order
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1
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48, 263, 1548, 9654, 61978, 405702, 2686876, 17926060, 120146998, 807610262, 5438698312, 36669657896, 247432193154, 1670424338586, 11280890946852, 76200323465372, 514795456961870, 3478208969481038, 23502035785763264
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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) = 16*a(n-1) -85*a(n-2) +142*a(n-3) +159*a(n-4) -676*a(n-5) +465*a(n-6) +298*a(n-7) -506*a(n-8) +220*a(n-9) -32*a(n-10)
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EXAMPLE
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Some solutions for n=4
..0..0..1....0..1..0....0..1..2....0..0..0....0..0..0....0..1..0....0..1..0
..1..2..1....1..2..1....1..2..0....0..1..0....0..1..0....0..1..0....0..1..0
..1..0..0....2..1..2....2..1..2....1..1..1....1..1..0....0..0..0....0..0..0
..1..2..1....0..2..0....0..2..1....2..1..0....2..1..0....1..0..1....2..0..2
..1..0..0....1..0..1....1..0..2....2..1..1....2..1..1....1..1..1....2..0..2
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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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