A302004 Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

0, 233, 499, 1394, 110036, 729297, 15243860, 204666568, 2933712940, 44201068772, 631467436258, 9310616032492, 135219892970154, 1977188363830961, 28827781254085548, 420748594948205104, 6138969205830064789

Offset: 1

Author

R. H. Hardin, Mar 30 2018

Keywords

• nonn

Comments

Row 7 of A301999.

Examples

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

Links

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

Crossrefs

Cf. A301999.