A298186 Number of nX7 0..1 arrays with every element equal to 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 8, 8, 9, 10, 14, 19, 27, 38, 58, 90, 142, 225, 362, 587, 959, 1572, 2587, 4270, 7067, 11718, 19462, 32366, 53887, 89799, 149757, 249902, 417231, 696895, 1164423, 1946165, 3253513, 5440154, 9097892, 15216993, 25454538, 42583510, 71244379

Offset: 1

Author

R. H. Hardin, Jan 14 2018

Keywords

• nonn

Comments

Column 7 of A298187.

Examples

			Some solutions for n=7
..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..0
..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..0
..0..0..0..0..0..1..1. .0..0..0..1..0..1..1. .0..0..0..1..1..0..0
..0..0..0..0..0..1..1. .1..1..1..0..1..0..0. .0..0..0..1..1..0..0
..0..0..0..0..0..1..1. .1..1..1..1..0..0..0. .0..0..0..1..1..0..0
..0..0..0..0..0..1..1. .1..1..1..1..0..0..0. .0..0..0..1..1..0..0
..0..0..0..0..0..1..1. .1..1..1..1..0..0..0. .0..0..0..1..1..0..0
		

Links

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

Crossrefs

Cf. A298187.

Formula

Empirical: a(n) = 3*a(n-1) -2*a(n-2) -a(n-3) +2*a(n-4) -2*a(n-5) +a(n-6) -a(n-7) +a(n-8) -a(n-10) +a(n-11) for n>12