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A187706
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Number of 3X3 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal
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1
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128, 1489, 8272, 31461, 93476, 235773, 524284, 1062857, 1999212, 3541677, 5967404, 9648841, 15048584, 22766353, 33534080, 48248321, 67983232, 94042589, 127929948, 171449249, 226655576, 295941137, 382036240, 488090685, 617595596, 774557293
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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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EXAMPLE
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Some n=3 solutions for 3X3
..3..0..0....2..0..3....0..0..1....3..1..1....0..0..3....2..0..0....2..0..0
..2..0..3....2..0..0....3..0..1....0..0..0....0..0..3....1..0..0....0..0..0
..1..0..0....1..0..0....2..0..3....3..2..1....3..0..1....0..0..3....0..2..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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