A284193 Number of n X 2 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 4, 13, 40, 131, 455, 1611, 5818, 21328, 78965, 294721, 1107257, 4182655, 15873631, 60485153, 231287810, 887184904, 3412621088, 13159857176, 50862414259, 196984720481, 764321821293, 2970680947542, 11563991293971, 45079009826426

Offset

1,1

Comments

Column 2 of A284199.

Links

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

Example

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

Crossrefs

Cf. A284199.

Sequence in context: A085422 A264630 A065601 * A148255 A148256 A163136

Adjacent sequences: A284190 A284191 A284192 * A284194 A284195 A284196

Keyword

nonn

Author

R. H. Hardin, Mar 22 2017

Status

approved