A303086 Number of 4Xn 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 3, 112, 90, 1455, 3667, 33152, 157838, 1161232, 7100035, 49678916, 329669849, 2281641594, 15540614996, 107301648292, 737154651791, 5087197252026, 35051028229325, 241871543186476, 1668193998276026, 11511498465288360

Offset: 1

Author

R. H. Hardin, Apr 18 2018

Keywords

• nonn

Comments

Row 4 of A303084.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 67

Crossrefs

Cf. A303084.

Formula

Empirical recurrence of order 67 (see link above)