The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A270115 Number of n X 5 0..7 arrays with some element plus some horizontally or vertically adjacent neighbor totalling seven exactly once. 1
10976, 345422784, 5795977666752, 81224231406183600, 1043364062813432764992, 12729704731136074190860176, 150106896816846862603331679744, 1727666938750128431329666085123136 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A270118.
LINKS
FORMULA
Empirical: a(n) = 21508*a(n-1) -131769514*a(n-2) +177803696938*a(n-3) -113194471117013*a(n-4) +41072139293972644*a(n-5) -9009512737177947337*a(n-6) +1174299801076139330678*a(n-7) -78815033190830617996130*a(n-8) +815915154281354277564428*a(n-9) +198823102698530600164550375*a(n-10) -6554822747169941935810364140*a(n-11) -168760243259405706734550783268*a(n-12) +2476292267732260255354825180992*a(n-13) -7634283380068607665468225784064*a(n-14) for n > 15.
EXAMPLE
Some solutions for n=1
..5..2..0..0..3. .6..1..3..5..0. .5..5..5..0..7. .1..6..7..3..0
CROSSREFS
Cf. A270118.
Sequence in context: A035913 A124668 A270148 * A335082 A104323 A252039
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 18 11:36 EDT 2024. Contains 372630 sequences. (Running on oeis4.)