A278650 Number of nX2 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

0, 0, 24, 1076, 19893, 235446, 2080575, 14836233, 89504692, 471646066, 2221297222, 9512455863, 37536099773, 137924875200, 475940969064, 1553081484256, 4820235461752, 14298088612192, 40701436072216, 111582345485761

Offset

1,3

Comments

Column 2 of A278656.

Links

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

R. H. Hardin, Empirical polynomial of degree 33

Formula

Empirical polynomial of degree 33 (see link above)

Example

Some solutions for n=4
..1..1. .0..0. .0..2. .1..1. .2..2. .2..2. .1..2. .1..2. .2..2. .0..2
..0..2. .1..2. .0..1. .0..2. .1..1. .2..0. .0..2. .0..2. .2..0. .2..2
..1..2. .1..0. .2..1. .1..2. .0..1. .1..1. .0..0. .2..1. .1..0. .1..2
..1..1. .0..1. .2..0. .0..0. .1..1. .0..1. .0..0. .2..0. .0..1. .0..1

Crossrefs

Cf. A278656.

Sequence in context: A272690 A112011 A112010 * A046906 A130552 A374885

Adjacent sequences: A278647 A278648 A278649 * A278651 A278652 A278653

Keyword

nonn

Author

R. H. Hardin, Nov 25 2016

Status

approved