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A368492 a(n) = Sum_{k=0..n} k^(n+k). 0
1, 1, 17, 762, 67788, 10034459, 2226678977, 691532161356, 286302140043208, 152380144397396525, 101369101598593980737, 82415052812980817676790, 80402388030057940015721524, 92697243086459794077519471767 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
G.f.: Sum_{k>=0} (k^2*x)^k / (1 - k*x).
a(n) ~ n^(2*n). - Vaclav Kotesovec, Dec 27 2023
PROG
(PARI) a(n) = sum(k=0, n, k^(n+k));
CROSSREFS
Sequence in context: A176233 A360647 A355495 * A012221 A012144 A265190
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Dec 27 2023
STATUS
approved

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Last modified April 14 00:20 EDT 2024. Contains 371652 sequences. (Running on oeis4.)