A297304 Number of 7Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s.

1, 1, 21, 69, 266, 1574, 13504, 93906, 551477, 3159693, 18792129, 113862870, 692747205, 4226551294, 25828653795, 157805371000, 963306137176, 5876339680839, 35834865220658, 218515617055715, 1332575380148292

Offset: 1

Author

R. H. Hardin, Dec 27 2017

Keywords

• nonn

Comments

Row 7 of A297299.

Examples

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

Links

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

Crossrefs

Cf. A297299.