A298919 Number of nX3 0..1 arrays with every element equal to 1, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 4, 1, 2, 3, 5, 8, 16, 21, 34, 55, 89, 144, 236, 377, 610, 987, 1597, 2584, 4184, 6765, 10946, 17711, 28657, 46368, 75028, 121393, 196418, 317811, 514229, 832040, 1346272, 2178309, 3524578, 5702887, 9227465, 14930352, 24157820, 39088169

Offset: 1

Author

R. H. Hardin, Jan 29 2018

Keywords

• nonn

Comments

Column 3 of A298924.

Examples

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

Links

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

Crossrefs

Cf. A298924.

Formula

Empirical: a(n) = a(n-1) +a(n-2) +a(n-6) -a(n-7) -a(n-8)