A278776 Number of nX6 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

21, 1750, 48501, 955347, 16205001, 251740932, 3634987413, 48847405083, 611199661843, 7140933364136, 78280456105686, 809842005695656, 7953581118077240, 74557744904209329, 670158115881138987

Offset

1,1

Comments

Column 6 of A278778.

Links

R. H. Hardin, Table of n, a(n) for n = 1..153

R. H. Hardin, Empirical polynomial of degree 134

Formula

Empirical polynomial of degree 134 (see link above)

Example

Some solutions for n=3
..1..0..0..0..1..1. .1..0..0..1..1..0. .1..0..1..1..1..1. .0..0..0..1..0..0
..0..1..0..0..1..1. .0..1..0..1..0..0. .1..1..1..1..1..0. .1..1..0..1..0..1
..1..1..0..0..1..1. .1..0..1..0..0..0. .0..0..0..0..0..0. .1..1..1..0..1..1

Crossrefs

Cf. A278778.

Sequence in context: A221033 A221497 A155740 * A296597 A203327 A375065

Adjacent sequences: A278773 A278774 A278775 * A278777 A278778 A278779

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved