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A278321
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Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
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1
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1, 94, 1678, 19854, 186987, 1548002, 11947350, 87562135, 605431820, 3905165468, 23355599964, 129475795828, 667503759881, 3215875683718, 14555156486463, 62204964640341, 252211338710097, 974245904884957, 3598868691539578
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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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FORMULA
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Empirical polynomial of degree 47 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..1..1..0. .1..1..0..0. .0..1..0..1. .0..1..0..1. .1..1..0..1
..1..0..1..1. .0..0..0..0. .0..1..1..1. .0..1..0..1. .1..1..0..1
..0..1..0..0. .1..1..1..1. .1..1..1..0. .0..0..0..0. .1..1..0..1
..1..1..0..1. .1..1..1..1. .0..1..1..1. .0..0..0..0. .0..0..1..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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