A302524 Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

2, 10, 42, 168, 902, 3256, 15852, 77904, 314276, 1506894, 7035934, 30537794, 143024948, 655833426, 2937151450, 13568476862, 61920768478, 280707441628, 1287994621032, 5873565899442, 26746065104754, 122342967545180

Offset: 1

Author

R. H. Hardin, Apr 09 2018

Keywords

• nonn

Comments

Column 4 of A302528.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 72

Crossrefs

Cf. A302528.

Formula

Empirical recurrence of order 72 (see link above)