A278321 Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences: A278318 A278319 A278320 * A278322 A278323 A278324

Keyword

nonn

Author

R. H. Hardin, Nov 18 2016

Status

approved