A278430 Number of nX2 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.

6, 100, 1609, 19624, 178352, 1287838, 7795151, 41058743, 193149285, 826734193, 3264405727, 12016477160, 41579224479, 136142690453, 424140541353, 1263030700894, 3609095743983, 9929303441355, 26377932553959, 67838309686132

Offset

1,1

Comments

Column 2 of A278435.

Links

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

R. H. Hardin, Empirical polynomial of degree 31

Formula

Empirical polynomial of degree 31 (see link above)

Example

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

Crossrefs

Cf. A278435.

Sequence in context: A281502 A226413 A226344 * A131311 A098721 A291837

Adjacent sequences: A278427 A278428 A278429 * A278431 A278432 A278433

Keyword

nonn

Author

R. H. Hardin, Nov 22 2016

Status

approved