A269049 Number of nX5 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

144, 1068, 13140, 149358, 1643376, 17696520, 187575858, 1964080920, 20365312416, 209472681102, 2140087086852, 21738862087680, 219728193571542, 2211332610944712, 22170082238167692, 221519854346189046

Offset: 1

Author

R. H. Hardin, Feb 18 2016

Keywords

• nonn

Comments

Column 5 of A269052.

Examples

			Some solutions for n=4
..0..1..2..2..0. .2..1..2..1..2. .0..1..2..1..2. .1..2..1..0..0
..0..1..2..1..2. .2..1..2..1..2. .0..0..0..1..0. .2..2..1..0..1
..0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0. .1..0..1..0..1
..0..1..0..1..0. .2..0..0..0..0. .0..0..0..1..2. .1..0..1..2..1
		

Links

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

Crossrefs

Cf. A269052.

Formula

Empirical: a(n) = 28*a(n-1) -286*a(n-2) +1290*a(n-3) -2373*a(n-4) +304*a(n-5) +3551*a(n-6) -2846*a(n-7) -546*a(n-8) +1308*a(n-9) -505*a(n-10) +76*a(n-11) -4*a(n-12) for n>13