A297400 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

1, 178, 963, 3924, 74736, 640562, 4279111, 46261441, 428200086, 3465586864, 32328050104, 296748190460, 2574529121380, 23200388627087, 210159449303417, 1865437561436124, 16702908801335717, 150242351184841826

Offset: 1

Author

R. H. Hardin, Dec 29 2017

Keywords

• nonn

Comments

Row 7 of A297395.

Examples

			Some solutions for n=5
..1..0..0..1..1. .1..0..0..1..1. .0..1..0..0..0. .1..1..0..1..0
..0..1..0..0..0. .0..1..0..0..0. .0..0..1..0..0. .0..0..0..0..1
..0..0..0..1..1. .0..1..0..1..1. .0..0..1..0..0. .0..1..1..0..0
..1..0..0..0..0. .1..0..0..0..0. .0..1..0..0..0. .0..0..0..0..1
..0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..0
..0..0..0..0..0. .0..0..1..0..0. .0..1..1..0..0. .0..1..0..0..0
..0..0..0..1..1. .0..0..0..1..0. .0..0..0..0..0. .0..0..1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 69

Crossrefs

Cf. A297395.

Formula

Empirical recurrence of order 69 (see link above)