A299735 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

4, 32, 220, 1578, 11303, 81105, 582032, 4177161, 29979239, 215160247, 1544201029, 11082704750, 79540390044, 570860083491, 4097053535956, 29404486634726, 211035522699946, 1514598516808216, 10870248941079889, 78015599995840787

Offset: 1

Author

R. H. Hardin, Feb 18 2018

Keywords

• nonn

Comments

Column 3 of A299740.

Examples

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

Links

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

Crossrefs

Cf. A299740.

Formula

Empirical: a(n) = 8*a(n-1) -4*a(n-2) -13*a(n-3) -6*a(n-4) +5*a(n-5) +23*a(n-6) -20*a(n-7) -12*a(n-8)