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A205628
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Number of 4X(n+1) 0..2 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..2 introduced in row major order
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1
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396, 2052, 13068, 94116, 708300, 5439324, 42094188, 327077484, 2547102732, 19867584972, 155171240076, 1213352429196, 9498114849804, 74428751347980, 583820737433100, 4583937157350924, 36024984866070540, 283374615043095564
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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) = 23*a(n-1) -174*a(n-2) +284*a(n-3) +2352*a(n-4) -10052*a(n-5) -1168*a(n-6) +65760*a(n-7) -78080*a(n-8) -116928*a(n-9) +255232*a(n-10) -49664*a(n-11) -116736*a(n-12) +49152*a(n-13)
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0....0..1..1..2..2....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....2..2..0..0..1....0..1..0..1..0....0..1..0..1..0
..1..2..1..2..2....1..2..2..0..0....1..0..1..0..1....2..1..2..1..2
..0..1..0..1..2....1..0..1..1..2....1..2..2..2..2....2..2..2..2..0
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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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