A297726 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 4 neighboring 1s.

1, 2735, 110551, 2139403, 91994155, 4238895126, 154327332017, 5699564719228, 225335188630385, 8767500946143576, 335583072729414460, 12937974222045436776, 500589141612794916455, 19317070336607603879897

Offset

1,2

Comments

Row 7 of A297720.

Links

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

Example

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

Crossrefs

Cf. A297720.

Sequence in context: A251989 A251985 A297512 * A122473 A253994 A253987

Adjacent sequences: A297723 A297724 A297725 * A297727 A297728 A297729

Keyword

nonn

Author

R. H. Hardin, Jan 04 2018

Status

approved