A268892 Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

0, 2285, 60666, 1706732, 39670270, 911930096, 19876401224, 426591159751, 8952723005030, 185650834624156, 3802871585155968, 77225962585267472, 1555913690406127580, 31149964203775581289, 620153220846869863058

Offset

1,2

Comments

Row 7 of A268886.

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
..1..0..0. .0..1..1. .1..0..0. .0..0..1. .0..1..0. .0..0..0. .0..0..1
..0..0..1. .0..0..0. .1..1..0. .1..0..0. .0..1..0. .0..0..1. .1..0..0
..1..0..0. .1..0..1. .0..0..1. .0..0..0. .1..0..1. .1..0..1. .1..0..0
..1..0..0. .1..0..1. .1..0..0. .0..0..0. .1..0..0. .0..0..1. .0..1..0
..0..1..0. .0..0..0. .1..0..1. .0..1..1. .1..0..0. .0..1..0. .0..1..0
..1..0..0. .1..0..1. .0..0..1. .0..0..0. .1..0..1. .0..1..0. .1..0..1
..1..0..0. .0..0..1. .0..0..0. .0..1..0. .0..0..0. .0..0..1. .0..0..0

Crossrefs

Cf. A268886.

Sequence in context: A247401 A264256 A236700 * A206663 A247990 A206103

Adjacent sequences: A268889 A268890 A268891 * A268893 A268894 A268895

Keyword

nonn

Author

R. H. Hardin, Feb 15 2016

Status

approved