A303317 Number of 5Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

16, 9, 19, 74, 139, 410, 1799, 5907, 16494, 53290, 184915, 593160, 1846238, 5986532, 19644799, 63120477, 201894029, 652765881, 2113653016, 6806905917, 21913260238, 70736938785, 228339832475, 736091706666, 2373144545904, 7656031069031

Offset: 1

Author

R. H. Hardin, Apr 21 2018

Keywords

• nonn

Comments

Row 5 of A303314.

Examples

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

Links

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

Crossrefs

Cf. A303314.

Formula

Empirical: a(n) = 2*a(n-1) -a(n-2) +11*a(n-3) +21*a(n-4) -13*a(n-5) +5*a(n-6) -37*a(n-7) -34*a(n-8) +4*a(n-9) -20*a(n-10) +18*a(n-11) -7*a(n-12) for n>16