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A271069
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Number of nXnXn triangular 0..1 arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal.
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2
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0, 1, 13, 138, 1628, 23527, 435147, 10546164, 339692832, 14675385285, 855707505235, 67645098281722, 7273718690098068, 1066532362363098251, 213665221064800026604, 58573977551568152227368
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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........0........0........0........0........0........0........0
....0.1......0.0......1.0......0.1......1.0......1.0......1.0......1.1
...1.1.1....0.1.1....1.0.0....1.1.1....1.0.0....1.0.1....0.0.0....0.1.0
..1.0.0.1..0.1.0.0..0.1.1.0..1.0.0.0..0.0.1.1..0.0.0.1..1.1.1.1..1.0.1.0
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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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