A284081 Number of 7Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.

0, 0, 353608, 48994058, 6011835223, 700044712076, 74965549398304, 7663959789277668, 759541318384819140, 73293744586522740828, 6926137628336309991716, 643615455040297408956707

Offset

1,3

Comments

Row 7 of A284075.

Links

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

Example

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

Crossrefs

Cf. A284075.

Sequence in context: A140942 A294858 A274900 * A050515 A179709 A186217

Adjacent sequences: A284078 A284079 A284080 * A284082 A284083 A284084

Keyword

nonn

Author

R. H. Hardin, Mar 19 2017

Status

approved