A303417 Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 128, 1985, 30897, 480960, 7486369, 116529645, 1813851698, 28233652317, 439473157219, 6840654335738, 106478748377005, 1657403414891639, 25798444493138200, 401567736789419233, 6250634501358061189

Offset: 1

Author

R. H. Hardin, Apr 23 2018

Keywords

• nonn

Comments

Column 4 of A303421.

Examples

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

Links

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

Crossrefs

Cf. A303421.

Formula

Empirical: a(n) = 14*a(n-1) +21*a(n-2) +54*a(n-3) -23*a(n-4) -18*a(n-5) -20*a(n-6)