OFFSET
0,3
LINKS
Eric Weisstein's World of Mathematics, Incomplete Gamma Function.
Wikipedia, Incomplete gamma function.
FORMULA
MATHEMATICA
a[n_]:=Numerator[(2(E*Gamma[n+1, 1]-1)-n)/n!]; Array[a, 25, 0]
PROG
(PARI) a(n) = numerator(sum(k=1, n, k^2/k!)); \\ Michel Marcus, Apr 07 2024
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Stefano Spezia, Apr 07 2024
STATUS
approved