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A265174
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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 and vertical neighbors by a power of two.
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1
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1, 4, 21, 139, 8463, 219995, 6639203, 149441692, 6260685646, 183876714594, 6508183174645, 200502557111619, 7365189521794194, 232750786457812689, 7646516518149412694, 242109459701672908262, 12925753804930923765113
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OFFSET
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1,2
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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..4....0..2....0..1....0..2....0..1....0..4....0..2....0..1....0..4....0..1
..1..5....2..6....1..5....2..3....4..5....1..2....2..4....4..5....4..5....4..2
..2..6....6..5....2..3....4..5....5..6....5..6....4..6....2..3....5..3....5..3
..3..7....5..7....3..7....3..7....3..7....3..7....6..7....3..7....6..7....6..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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