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A127228
a(n) = numerator of ((n + 4)! - (n - 4)!)/(n!).
5
40319, 362879, 1814399, 6652799, 19958399, 51891839, 121080959, 259459199, 518918399, 980179199, 1764322559, 3047466239, 5079110399, 8204716799, 12893126399, 19769460479, 29654190719, 43609103999, 62990927999
OFFSET
4,1
LINKS
FORMULA
a(n) = (n+4) * (n+3) * (n+2) * (n+1) * n * (n-1) * (n-2) * (n-3) - 1. - Robert Israel, Nov 20 2023
MAPLE
f::= n -> (n+4)*(n+3)*(n+2)*(n+1)*n*(n-1)*(n-2)*(n-3)-1:
map(f, [$4..30]); # Robert Israel, Nov 20 2023
MATHEMATICA
Table[Numerator[((n + 4)! - (n - 4)!)/(n!)], {n, 4, 30}]
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Artur Jasinski, Jan 09 2007
STATUS
approved