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A278774 Number of nX4 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 1
1, 117, 1972, 19750, 150085, 955347, 5355983, 27218249, 127644118, 559023840, 2305566900, 9009824325, 33520023813, 119176965881, 406212717567, 1330964850429, 4202125841615, 12811256626245, 37790376053439 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A278778.

LINKS

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

R. H. Hardin, Empirical polynomial of degree 36

FORMULA

Empirical polynomial of degree 36 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A278778.

Sequence in context: A326064 A233376 A233051 * A219990 A223749 A218416

Adjacent sequences:  A278771 A278772 A278773 * A278775 A278776 A278777

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 2016

STATUS

approved

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Last modified November 12 22:10 EST 2019. Contains 329079 sequences. (Running on oeis4.)