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

Author

R. H. Hardin, Nov 24 2016

Keywords

• nonn

Comments

Column 3 of A278627.

Examples

			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
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 43

Crossrefs

Cf. A278627.

Formula

Empirical polynomial of degree 43 (see link above)