A278630 Number of nX4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

15, 3354, 234484, 10776210, 387551595, 11719632199, 309971214338, 7350438329498, 158870607154260, 3165150394868325, 58584816738347925, 1013219703287606525, 16445858865221341430, 251416530890380206352

Offset: 1

Author

R. H. Hardin, Nov 24 2016

Keywords

• nonn

Comments

Column 4 of A278634.

Examples

			Some solutions for n=2
..2..0..1..0. .1..2..2..1. .1..1..2..0. .0..0..2..2. .2..0..2..1
..0..0..1..2. .0..2..2..1. .1..1..1..2. .0..0..2..0. .0..0..1..2
		

Links

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

Crossrefs

Cf. A278634.