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A269001
Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
1
128, 3272, 91491, 2144780, 49084071, 1073436321, 22995344760, 483176766982, 10012943674291, 205190835537996, 4165999185526245, 83946395869892249, 1680542804576091072, 33458893826064355756, 662949906600663076935
OFFSET
1,1
COMMENTS
Row 7 of A268995.
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 17 2016
STATUS
approved