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A278321 Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes. 1
1, 94, 1678, 19854, 186987, 1548002, 11947350, 87562135, 605431820, 3905165468, 23355599964, 129475795828, 667503759881, 3215875683718, 14555156486463, 62204964640341, 252211338710097, 974245904884957, 3598868691539578 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A278325.

LINKS

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

FORMULA

Empirical polynomial of degree 47 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A278325.

Sequence in context: A220797 A220961 A218648 * A189414 A195757 A017810

Adjacent sequences:  A278318 A278319 A278320 * A278322 A278323 A278324

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 18 2016

STATUS

approved

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Last modified January 17 19:58 EST 2019. Contains 319251 sequences. (Running on oeis4.)