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A252683
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Number of (4+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7
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1
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1010, 1677, 4298, 7747, 26744, 78851, 147462, 519311, 1555755, 2915082, 10313664, 30980483, 58079774, 205778379, 618405463, 1159066270, 4109895588, 12351404831, 23142304030, 82115735795, 246768222195, 462191279878, 1641080449028
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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) = 45*a(n-3) -591*a(n-6) +1616*a(n-9) +5316*a(n-12) -24526*a(n-15) +2476*a(n-18) +88284*a(n-21) -67519*a(n-24) -126947*a(n-27) +143243*a(n-30) +52204*a(n-33) -73468*a(n-36) -2196*a(n-39) +2064*a(n-42) for n>46
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EXAMPLE
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Some solutions for n=4
..1..2..2..3..2..1....0..2..0..0..2..3....0..0..2..3..2..2....0..1..1..0..1..1
..3..2..0..0..2..0....1..1..0..1..1..0....3..1..1..0..1..1....0..2..3..0..2..3
..0..0..2..0..0..2....0..1..1..0..1..1....1..0..1..1..0..1....1..1..0..1..1..0
..1..2..2..3..2..2....0..2..0..0..2..3....0..0..2..3..0..2....0..1..1..0..1..1
..0..2..0..0..2..0....1..1..0..1..1..0....3..1..1..0..1..1....2..2..3..0..2..0
..0..0..2..0..0..2....0..1..1..0..1..1....1..0..1..1..0..1....1..1..0..1..1..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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