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A265631
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Number of nX2 0..n*2-1 arrays with upper left zero and lower right n*2-1 and each element differing from its horizontal, diagonal and antidiagonal neighbors by a power of two.
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1
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1, 0, 21, 585, 8463, 294394, 6639203, 120126908, 6260685646, 196840463674, 6508183174645, 197814464077227, 7365189521794194, 230043726410889775, 7646516518149412694, 244311983316534271813, 12925753804930923765113
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..2....0..1....0..2....0..1....0..4....0..4....0..1....0..2....0..4....0..2
..3..1....3..1....6..2....2..4....6..2....3..4....3..2....6..4....3..4....6..4
..5..7....3..5....3..7....6..4....3..4....6..4....3..4....5..4....5..7....6..4
..6..7....6..7....6..7....3..7....6..7....5..7....3..7....6..7....6..7....3..7
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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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