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A268992 Number of nX5 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. 3
23, 278, 3331, 37987, 421450, 4583103, 49084071, 519385102, 5442503771, 56571775611, 584048456162, 5994862809815, 61225907059807, 622579765715526, 6306473266306611, 63664757730483923, 640753995659371194 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A268995.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 17 2016
STATUS
approved

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Last modified March 1 20:05 EST 2024. Contains 370443 sequences. (Running on oeis4.)