OFFSET
0,2
MATHEMATICA
a[n_] := 1 + Sum[k^k * Binomial[n, k]^2, {k, 1, n}]; Array[a, 20, 0] (* Amiram Eldar, Aug 09 2020 *)
PROG
(PARI) {a(n) = sum(k=0, n, k^k*binomial(n, k)^2)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Aug 09 2020
STATUS
approved