A302169 Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

64, 86, 111, 361, 621, 1563, 2853, 7306, 12963, 33522, 61775, 157788, 293072, 746806, 1414502, 3560709, 6821117, 17041351, 33109869, 81878009, 160823108, 394307941, 783258522, 1903510955, 3817195020, 9202579162, 18623741941, 44557228577

Offset: 1

Author

R. H. Hardin, Apr 02 2018

Keywords

• nonn

Comments

Row 7 of A302163.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 80

Crossrefs

Cf. A302163.

Formula

Empirical recurrence of order 80 (see link above)