A268992 - OEIS

A268992

Number of nX5 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

23, 278, 3331, 37987, 421450, 4583103, 49084071, 519385102, 5442503771, 56571775611, 584048456162, 5994862809815, 61225907059807, 622579765715526, 6306473266306611, 63664757730483923, 640753995659371194

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OFFSET

1,1

COMMENTS

Column 5 of A268995.

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-1) -241*a(n-2) +994*a(n-3) -2060*a(n-4) +2218*a(n-5) -1201*a(n-6) +290*a(n-7) -25*a(n-8) for n>9

EXAMPLE

Some solutions for n=4

..0..1..0..0..1. .0..1..0..0..0. .0..1..0..1..1. .0..1..0..0..0

..0..1..0..0..1. .0..0..0..0..1. .0..1..0..0..0. .0..0..1..0..0

..1..0..1..0..0. .1..0..0..0..1. .0..0..1..0..0. .1..0..1..1..0

..1..0..1..0..1. .0..1..0..0..0. .0..0..1..0..0. .0..0..0..0..1

CROSSREFS

Cf. A268995.

Sequence in context: A162680 A010975 A022588 * A199031 A125435 A086943

Adjacent sequences: A268989 A268990 A268991 * A268993 A268994 A268995

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2016

STATUS

approved