login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 18 03:09 EDT 2021. Contains 347504 sequences. (Running on oeis4.)