A284217 Number of n X 3 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

3, 13, 70, 467, 3224, 23218, 170155, 1264605, 9488108, 71718240, 545264052, 4165262662, 31943452900, 245786167555, 1896529843618, 14669730799547, 113713016901442, 883107039574428, 6869733556332042, 53519589494550372

Offset

1,1

Comments

Column 3 of A284222.

Links

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

Example

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

Crossrefs

Cf. A284222.

Sequence in context: A121586 A024337 A001495 * A213690 A227117 A277922

Adjacent sequences: A284214 A284215 A284216 * A284218 A284219 A284220

Keyword

nonn

Author

R. H. Hardin, Mar 23 2017

Status

approved