A269085 Number of nX4 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.

13, 76, 428, 2238, 11314, 55620, 268289, 1274435, 5982734, 27813229, 128268964, 587560638, 2675945006, 12126527636, 54715085702, 245932380152, 1101667424213, 4920048498594, 21913218006880, 97358802936939, 431593734805059

Offset: 1

Author

R. H. Hardin, Feb 19 2016

Keywords

• nonn

Comments

Column 4 of A269089.

Examples

			Some solutions for n=4
..1..0..0..1. .1..1..0..0. .0..0..0..0. .0..0..1..0. .1..0..0..0
..1..0..0..0. .0..0..0..1. .1..0..1..0. .0..0..0..1. .0..0..1..0
..0..1..0..1. .0..0..0..0. .1..0..0..0. .0..0..1..0. .0..0..0..1
..0..0..0..0. .0..1..0..1. .0..1..0..0. .1..0..0..0. .0..0..0..0
		

Links

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

Crossrefs

Cf. A269089.

Formula

Empirical: a(n) = 2*a(n-1) +19*a(n-2) +10*a(n-3) -122*a(n-4) -320*a(n-5) -295*a(n-6) +8*a(n-7) +176*a(n-8) +20*a(n-9) -98*a(n-10) -6*a(n-11) +43*a(n-12) -6*a(n-13) -11*a(n-14) +6*a(n-15) -a(n-16)