A269001 Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

128, 3272, 91491, 2144780, 49084071, 1073436321, 22995344760, 483176766982, 10012943674291, 205190835537996, 4165999185526245, 83946395869892249, 1680542804576091072, 33458893826064355756, 662949906600663076935

Offset

1,1

Comments

Row 7 of A268995.

Links

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

R. H. Hardin, Empirical recurrence of order 68

Formula

Empirical recurrence of order 68 (see link above)

Example

Some solutions for n=3
..0..1..1. .1..0..0. .0..0..1. .1..1..0. .0..0..1. .1..1..0. .0..1..0
..0..0..1. .0..1..0. .1..0..1. .0..0..1. .1..0..1. .0..0..0. .0..0..1
..1..0..0. .0..1..1. .0..0..0. .0..0..0. .0..0..0. .1..0..0. .1..0..1
..0..0..1. .0..0..0. .1..0..1. .1..0..1. .0..0..1. .0..1..0. .1..0..0
..1..0..1. .0..0..1. .0..0..1. .1..0..0. .0..1..0. .0..0..0. .0..0..0
..0..0..0. .0..0..1. .0..0..0. .1..0..1. .0..1..0. .0..1..0. .1..0..0
..0..0..1. .1..0..0. .0..1..0. .1..0..0. .0..0..0. .0..0..1. .1..0..0

Crossrefs

Cf. A268995.

Sequence in context: A250565 A264383 A022150 * A191899 A191495 A250172

Adjacent sequences: A268998 A268999 A269000 * A269002 A269003 A269004

Keyword

nonn

Author

R. H. Hardin, Feb 17 2016

Status

approved