OFFSET
0,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..29
FORMULA
a(n) ~ 2^((n+3)/2) * Pi^((n+1)/2) * n^((n+1)*(2*n+1)/2) / exp(n^2 + n - 1/12).
a(n) ~ 2 * (n!)^(n+1). - Vaclav Kotesovec, Mar 28 2019
MATHEMATICA
Table[Product[n!+k!, {k, 0, n}], {n, 0, 10}]
PROG
(Magma) F:= Factorial; [(&*[F(n) + F(j): j in [0..n]]): n in [0..20]]; // G. C. Greubel, Aug 30 2023
(SageMath) f=factorial; [product(f(n) + f(k) for k in range(n+1)) for n in range(21)] # G. C. Greubel, Aug 30 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jan 25 2019
STATUS
approved