A268748 Number of nX6 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

41, 659, 10830, 165019, 2425799, 34732937, 487682438, 6746117783, 92215499119, 1248437108837, 16766958502992, 223674635599161, 2966748789292217, 39154974765661223, 514529476985579624, 6735601878829825279

Offset: 1

Author

R. H. Hardin, Feb 12 2016

Keywords

• nonn

Comments

Column 6 of A268750.

Examples

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

Links

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

Crossrefs

Cf. A268750.

Formula

Empirical: a(n) = 16*a(n-1) +60*a(n-2) -1148*a(n-3) -3346*a(n-4) +16272*a(n-5) +36588*a(n-6) -104246*a(n-7) -147989*a(n-8) +349140*a(n-9) +217324*a(n-10) -591448*a(n-11) -19320*a(n-12) +431032*a(n-13) -151921*a(n-14) -73194*a(n-15) +41684*a(n-16) +2552*a(n-17) -3594*a(n-18) +148*a(n-19) +100*a(n-20) -4*a(n-21) -a(n-22)