A286973 Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.

0, 0, 5, 30, 126, 520, 2088, 8192, 32083, 125728, 492331, 1927334, 7545086, 29542032, 115713230, 453479812, 1778221568, 6976989468, 27390464896, 107590106636, 422842742731, 1662688326476, 6541232413273, 25746371202362, 101384373381977

Offset

1,3

Comments

Column 2 of A286979.

Links

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

Example

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

Crossrefs

Cf. A286979.

Sequence in context: A047661 A000649 A027173 * A196452 A227267 A213260

Adjacent sequences: A286970 A286971 A286972 * A286974 A286975 A286976

Keyword

nonn

Author

R. H. Hardin, May 17 2017

Status

approved