A268746 Number of nX4 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

13, 89, 623, 4110, 26334, 165019, 1016807, 6183665, 37209717, 221970102, 1314544140, 7737069617, 45297553803, 263980824665, 1532201345489, 8861529601362, 51088246525260, 293694819166095, 1684057081243885

Offset

1,1

Comments

Column 4 of A268750.

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +2*a(n-2) -82*a(n-3) -49*a(n-4) +124*a(n-5) +39*a(n-6) -58*a(n-7) -6*a(n-8) +8*a(n-9) -a(n-10)

Example

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

Crossrefs

Cf. A268750.

Sequence in context: A357219 A082099 A282858 * A152867 A026912 A161465

Adjacent sequences: A268743 A268744 A268745 * A268747 A268748 A268749

Keyword

nonn

Author

R. H. Hardin, Feb 12 2016

Status

approved