A278794 Number of nX3 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

4, 1713, 145208, 7196852, 263134490, 7804657491, 197112382716, 4361870602212, 86190316947578, 1541836669016245, 25236090146159518, 381171321062737412, 5350587072804920340, 70218509804475284134, 865927060368778196406

Offset

1,1

Comments

Column 3 of A278798.

Links

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

R. H. Hardin, Empirical polynomial of degree 173

Formula

Empirical polynomial of degree 173 (see link above)

Example

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

Crossrefs

Cf. A278798.

Sequence in context: A160225 A377601 A316484 * A141090 A307580 A255268

Adjacent sequences: A278791 A278792 A278793 * A278795 A278796 A278797

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved