A278793 Number of nX2 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

0, 44, 1713, 34348, 468496, 4888659, 41698446, 303361302, 1938464178, 11113364813, 58083296635, 280168918756, 1259424247108, 5317482568472, 21222955187222, 80498197428443, 291472386647409, 1011352733367759

Offset

1,2

Comments

Column 2 of A278798.

Links

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

R. H. Hardin, Empirical polynomial of degree 44

Formula

Empirical polynomial of degree 44 (see link above)

Example

Some solutions for n=4
..1..3. .1..3. .3..1. .0..3. .1..3. .3..0. .3..2. .0..2. .3..0. .3..2
..2..1. .1..0. .1..1. .2..0. .0..1. .0..3. .1..2. .0..2. .2..0. .2..2
..0..1. .1..2. .0..2. .3..1. .3..0. .3..2. .1..3. .3..0. .3..1. .3..3
..3..0. .3..1. .1..2. .1..0. .3..1. .0..0. .0..1. .1..0. .0..2. .2..0

Crossrefs

Cf. A278798.

Sequence in context: A004340 A231262 A223049 * A004295 A162882 A163230

Adjacent sequences: A278790 A278791 A278792 * A278794 A278795 A278796

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved