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A278771 Number of nXn 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 0
0, 2, 266, 19750, 1673658, 251740932, 90752836672, 93037538287080, 293564184229043556, 2953569640505846392444 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A278778.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

..1..0..0..0. .0..0..0..0. .1..0..0..1. .1..1..0..0. .0..0..1..0

..1..1..0..1. .1..0..1..0. .1..1..1..1. .0..0..1..1. .1..0..0..0

..1..1..0..1. .0..0..0..0. .0..0..0..0. .0..0..1..0. .0..0..0..0

..1..0..0..0. .0..0..0..1. .1..1..1..0. .1..0..1..0. .0..0..1..1

CROSSREFS

Cf. A278778.

Sequence in context: A135388 A238983 A188964 * A318171 A324596 A007512

Adjacent sequences:  A278768 A278769 A278770 * A278772 A278773 A278774

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 2016

STATUS

approved

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Last modified October 21 20:44 EDT 2019. Contains 328315 sequences. (Running on oeis4.)