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A183275
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Half the number of nXnXn triangular binary arrays with each element having no more than two neighbors equal to itself
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0
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1, 4, 16, 67, 277, 1025, 3407, 10265, 28589, 74945, 187583, 453167, 1065257, 2451317, 5546819, 12383627, 27347117, 59851121, 130009223, 280620167, 602424305, 1287187757, 2739013259, 5807246915, 12272861813, 25862365481
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for 5X5X5 with a(1,1)=0
......0..........0..........0..........0..........0..........0..........0
.....1.1........0.1........1.1........1.1........1.1........1.0........1.1
....1.0.1......1.1.0......1.0.0......1.0.1......0.0.1......1.0.1......0.0.0
...0.1.0.1....1.0.0.1....0.1.1.1....1.0.1.0....1.1.0.0....0.0.1.0....0.1.1.0
..1.0.1.1.0..1.0.1.1.0..1.0.0.0.1..0.1.1.0.0..1.0.1.1.0..1.1.1.0.0..1.0.1.0.1
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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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