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A278630 Number of nX4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 1
15, 3354, 234484, 10776210, 387551595, 11719632199, 309971214338, 7350438329498, 158870607154260, 3165150394868325, 58584816738347925, 1013219703287606525, 16445858865221341430, 251416530890380206352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A278634.

LINKS

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

EXAMPLE

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

CROSSREFS

Cf. A278634.

Sequence in context: A080691 A208584 A211903 * A161584 A013720 A230672

Adjacent sequences:  A278627 A278628 A278629 * A278631 A278632 A278633

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 24 2016

STATUS

approved

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Last modified October 26 08:00 EDT 2021. Contains 348267 sequences. (Running on oeis4.)