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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

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

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

Adjacent sequences:  A252872 A252873 A252874 * A252876 A252877 A252878

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 24 2014

STATUS

approved

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Last modified September 20 07:46 EDT 2020. Contains 337264 sequences. (Running on oeis4.)