A278622 Number of nX3 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

16, 357, 4754, 49503, 439446, 3438414, 24103803, 153073965, 888863183, 4758719096, 23665023516, 110046094356, 481337375925, 1990600963219, 7819169497216, 29290369365213, 105007107699726, 361416768054859

Offset

1,1

Comments

Column 3 of A278627.

Links

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

R. H. Hardin, Empirical polynomial of degree 43

Formula

Empirical polynomial of degree 43 (see link above)

Example

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

Crossrefs

Cf. A278627.

Sequence in context: A223032 A171680 A208706 * A155122 A094101 A034673

Adjacent sequences: A278619 A278620 A278621 * A278623 A278624 A278625

Keyword

nonn

Author

R. H. Hardin, Nov 24 2016

Status

approved