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A203917
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Number of (n+2)X4 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order
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1
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392, 1682, 6050, 21632, 77618, 279752, 1008200, 3628818, 13056050, 46986818, 169132832, 608795618, 2191220000, 7886675232, 28386296450, 102170984882, 367744025618, 1323616564512, 4764074516450, 17147281548168, 61718049816200
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OFFSET
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1,1
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COMMENTS
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Column 2 of A203923
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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) = 3*a(n-1) +3*a(n-3) +16*a(n-4) +10*a(n-5) -16*a(n-6) -17*a(n-7) -5*a(n-8) -2*a(n-9) +a(n-10) for n>11
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EXAMPLE
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Some solutions for n=3
..0..0..1..1....0..1..1..1....0..0..1..1....0..0..0..0....0..0..1..0
..0..0..1..0....1..1..1..1....0..0..0..0....0..0..0..0....0..1..0..1
..0..1..0..1....1..1..1..1....1..0..0..0....0..0..0..1....1..0..1..0
..1..0..1..0....1..1..1..1....0..0..0..1....1..0..0..1....1..1..0..0
..1..0..0..1....0..1..1..1....0..1..0..0....0..0..0..0....0..0..1..0
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CROSSREFS
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Sequence in context: A248022 A261379 A235313 * A180295 A166988 A264311
Adjacent sequences: A203914 A203915 A203916 * A203918 A203919 A203920
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 07 2012
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STATUS
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approved
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