A289645 Number of n X 2 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.

0, 2, 11, 44, 170, 642, 2421, 9142, 34572, 131086, 498465, 1900928, 7269978, 27879108, 107183763, 413052074, 1595247760, 6173412924, 23934713193, 92955294982, 361580812792, 1408539219596, 5494347736318, 21458645441596

Offset

1,2

Comments

Column 2 of A289651.

Links

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

Example

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

Crossrefs

Cf. A289651.

Sequence in context: A241712 A066058 A153440 * A181369 A037744 A037625

Adjacent sequences: A289642 A289643 A289644 * A289646 A289647 A289648

Keyword

nonn

Author

R. H. Hardin, Jul 09 2017

Status

approved