A283578 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 one element.

0, 3232, 194173, 4441052, 164714523, 4558585174, 129997769458, 3650965394740, 99090078168196, 2687260014584534, 71764403257467215, 1902366721060350320, 50085438054862185785, 1310060351650654162702, 34098186251976982332364

Offset

1,2

Comments

Row 7 of A283572.

Links

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

Example

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

Crossrefs

Cf. A283572.

Sequence in context: A020414 A202612 A295474 * A231141 A252611 A361262

Adjacent sequences: A283575 A283576 A283577 * A283579 A283580 A283581

Keyword

nonn

Author

R. H. Hardin, Mar 11 2017

Status

approved