A283633 Number of nX7 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.

13, 2076, 127635, 6345928, 272974255, 10666178322, 392539665568, 13797245749346, 468742166961530, 15502521715119538, 501795715376231851, 15957781722597713676, 500040694917490469472, 15473893797643876157146

Offset

1,1

Comments

Column 7 of A283634.

Links

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

Example

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

Crossrefs

Cf. A283634.

Sequence in context: A196801 A196589 A197046 * A221823 A075601 A325216

Adjacent sequences: A283630 A283631 A283632 * A283634 A283635 A283636

Keyword

nonn

Author

R. H. Hardin, Mar 12 2017

Status

approved