A283640 Number of 7Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.

0, 2458, 203025, 8209582, 317384829, 11651389723, 392539665568, 12499158065289, 391064828730137, 11763799548894544, 348148848497732064, 10109926834771861782, 289155453391286387579, 8172119594621868557289

Offset

1,2

Comments

Row 7 of A283634.

Links

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

Example

Some solutions for n=2
..0..1. .1..0. .0..0. .0..1. .0..0. .1..1. .1..0. .0..0. .0..1. .0..1
..1..1. .1..0. .0..1. .1..1. .1..1. .0..1. .0..0. .1..1. .0..0. .1..1
..0..1. .1..0. .1..0. .1..0. .0..1. .0..0. .1..1. .0..0. .1..0. .1..0
..0..0. .1..0. .1..0. .0..0. .0..1. .1..0. .0..1. .1..0. .0..0. .0..0
..0..0. .1..1. .0..1. .1..0. .1..1. .1..0. .1..0. .0..1. .1..0. .0..1
..1..1. .0..1. .1..0. .0..1. .0..0. .1..0. .0..0. .1..0. .0..1. .0..0
..0..1. .0..0. .0..1. .0..1. .1..1. .1..1. .1..1. .0..1. .1..1. .0..1

Crossrefs

Cf. A283634.

Sequence in context: A252098 A252097 A252225 * A043588 A043798 A043814

Adjacent sequences: A283637 A283638 A283639 * A283641 A283642 A283643

Keyword

nonn

Author

R. H. Hardin, Mar 12 2017

Status

approved