A278890 Number of nX2 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

0, 0, 161, 12392, 389640, 7709668, 112188011, 1300739542, 12621192562, 105953411156, 788164855062, 5289150309598, 32465951875890, 184286234335846, 975907732553934, 4856388450986535, 22846263739979319, 102119704122961051

Offset

1,3

Comments

Column 2 of A278896.

Links

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

R. H. Hardin, Empirical polynomial of degree 60

Formula

Empirical polynomial of degree 60 (see link above)

Example

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

Crossrefs

Cf. A278896.

Sequence in context: A232072 A278205 A197089 * A135699 A092312 A207232

Adjacent sequences: A278887 A278888 A278889 * A278891 A278892 A278893

Keyword

nonn

Author

R. H. Hardin, Nov 30 2016

Status

approved