A303411 Number of 4Xn 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 23, 119, 168, 547, 2079, 6322, 17903, 53665, 177334, 555813, 1667489, 5141358, 16219859, 50536643, 155427826, 481370601, 1501569819, 4667505936, 14454412939, 44845109069, 139426950850, 433097541907, 1343835090319, 4171764326604

Offset: 1

Author

R. H. Hardin, Apr 23 2018

Keywords

• nonn

Comments

Row 4 of A303410.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 71

Crossrefs

Cf. A303410.

Formula

Empirical recurrence of order 71 (see link above)