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!)
A252875 Number of nX7 nonnegative integer arrays with upper left 0 and lower right n+7-4 and value increasing by 0 or 1 with every step right or down 2
15, 211, 1948, 12686, 64920, 277585, 1030330, 3407823, 10237249, 28340232, 73128376, 177500233, 408299906, 895580310, 1882850350, 3810729118, 7452433875, 14127861337, 26034391284, 46747817584, 81967052716, 140602733711 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A252876
LINKS
FORMULA
Empirical: a(n) = (1/660441600)*n^14 + (1/9434880)*n^13 + (1/311850)*n^12 + (283/4989600)*n^11 + (23/34560)*n^10 + (5/896)*n^9 + (55843/1587600)*n^8 + (153793/907200)*n^7 + (4422487/7257600)*n^6 + (1152217/725760)*n^5 + (14953/4800)*n^4 + (834067/302400)*n^3 + (46071121/16816800)*n^2 - (359/17160)*n + 4
EXAMPLE
Some solutions for n=3
..0..0..1..1..2..3..4....0..1..2..3..4..4..4....0..1..2..3..3..4..5
..1..1..2..2..3..4..5....1..2..3..4..4..5..5....1..2..2..3..4..5..6
..2..2..2..3..4..5..6....1..2..3..4..5..5..6....1..2..3..4..5..5..6
CROSSREFS
Sequence in context: A001880 A240682 A113362 * A135519 A179091 A201340
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 24 2014
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 March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)