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A278321
Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
1
1, 94, 1678, 19854, 186987, 1548002, 11947350, 87562135, 605431820, 3905165468, 23355599964, 129475795828, 667503759881, 3215875683718, 14555156486463, 62204964640341, 252211338710097, 974245904884957, 3598868691539578
OFFSET
1,2
COMMENTS
Column 4 of A278325.
LINKS
FORMULA
Empirical polynomial of degree 47 (see link above)
EXAMPLE
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
CROSSREFS
Cf. A278325.
Sequence in context: A220797 A220961 A218648 * A189414 A339143 A370237
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 18 2016
STATUS
approved