A268993 Number of nX6 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

41, 763, 14080, 244397, 4097199, 66954420, 1073436321, 16957258387, 264744926212, 4093941136805, 62806688095479, 957111538353668, 14502245681077257, 218656000387543867, 3282569954305098964

Offset

1,1

Comments

Column 6 of A268995.

Links

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

Formula

Empirical: a(n) = 42*a(n-1) -665*a(n-2) +5138*a(n-3) -21972*a(n-4) +55274*a(n-5) -83769*a(n-6) +76202*a(n-7) -40273*a(n-8) +11304*a(n-9) -1296*a(n-10) for n>12

Example

Some solutions for n=3
..0..1..0..0..0..1. .1..0..1..0..0..1. .0..0..0..0..0..0. .0..0..1..0..1..0
..0..1..0..0..0..0. .1..0..0..0..0..1. .1..0..0..0..0..0. .1..0..0..0..1..1
..1..0..0..0..1..0. .0..1..1..0..0..1. .1..0..0..0..1..0. .0..0..0..0..0..0

Crossrefs

Cf. A268995.

Sequence in context: A299552 A246642 A167737 * A125551 A087856 A010957

Adjacent sequences: A268990 A268991 A268992 * A268994 A268995 A268996

Keyword

nonn

Author

R. H. Hardin, Feb 17 2016

Status

approved