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A252189
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Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7
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1
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5300, 6368, 8945, 14130, 24956, 37035, 57284, 99128, 151616, 245908, 420808, 657008, 1113688, 1927880, 3098960, 5528048, 9700168, 16202576, 30747088, 54771272, 95341136, 192162896, 346971208, 625763408, 1322237008, 2411214920
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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) = 15*a(n-3) -70*a(n-6) +120*a(n-9) -64*a(n-12) for n>22
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EXAMPLE
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Some solutions for n=4
..0..0..0..3..0..3..3....3..2..1..3..2..1..0....0..3..0..0..0..0..0
..2..1..3..2..1..3..2....0..3..0..0..3..3..0....3..2..1..3..2..1..3
..1..2..3..1..2..0..1....0..1..2..0..1..2..0....0..1..2..0..1..2..3
..3..0..0..0..0..0..3....3..2..1..0..2..1..3....0..3..0..0..3..0..0
..2..1..3..2..1..3..2....0..3..3..0..3..0..0....0..2..1..3..2..1..3
..1..2..0..1..2..3..1....0..1..2..0..1..2..0....0..1..2..0..1..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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