OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..221
FORMULA
a(n) ~ exp((Pi-4)*n/2) * n^(2*n+2).
MATHEMATICA
Table[Product[k^2+(n-k)^2, {k, 0, n}], {n, 0, 20}]
PROG
(PARI) m=2; vector(20, n, n--; prod(k=0, n, k^m + (n-k)^m)) \\ G. C. Greubel, Jan 18 2019
(Magma) m:=2; [(&*[k^m + (n-k)^m: k in [0..n]]): n in [0..20]]; // G. C. Greubel, Jan 18 2019
(Sage) m=2; [product(k^m +(n-k)^m for k in (0..n)) for n in (0..20)] # G. C. Greubel, Jan 18 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jan 17 2019
STATUS
approved