A278851 Number of nX4 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

0, 25, 1348, 30772, 449677, 4950399, 44571591, 344302564, 2353207764, 14536481606, 82424606803, 434031398793, 2141802790067, 9975624305928, 44106878749240, 186005545087412, 751100286992318, 2913746151722174

Offset

1,2

Comments

Column 4 of A278855.

Links

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

R. H. Hardin, Empirical polynomial of degree 52

Formula

Empirical polynomial of degree 52 (see link above)

Example

Some solutions for n=4
..1..0..1..0. .1..0..1..0. .1..0..0..1. .0..1..1..1. .0..0..0..1
..1..0..0..0. .0..1..0..1. .0..0..1..0. .0..0..1..1. .1..1..1..1
..1..1..0..1. .1..1..1..0. .0..0..1..1. .1..0..0..0. .1..0..1..1
..0..1..1..1. .1..0..1..0. .1..1..0..0. .1..0..0..0. .1..1..1..0

Crossrefs

Cf. A278855.

Sequence in context: A042200 A104593 A046910 * A243943 A192107 A206465

Adjacent sequences: A278848 A278849 A278850 * A278852 A278853 A278854

Keyword

nonn

Author

R. H. Hardin, Nov 29 2016

Status

approved