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A252710 Sum_{k=0..n} k^(n-k)*(n+k)^k. 3
2, 19, 270, 5274, 131250, 3971953, 141615782, 5814096100, 270145723914, 14014491434175, 802959561033630, 50357860270776302, 3431283333644097698, 252413829036827831821, 19937800344936448113750, 1683065517269356710047112, 151213514611062314791034874 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) ~ 2^n * n^n / (1-exp(-1/2)/2). - Vaclav Kotesovec, Dec 20 2014
MATHEMATICA
Table[Sum[k^(n-k)*(n+k)^k, {k, 0, n}], {n, 1, 20}]
CROSSREFS
Sequence in context: A239108 A191806 A349721 * A065923 A293946 A365652
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Dec 20 2014
STATUS
approved

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Last modified July 14 00:54 EDT 2024. Contains 374290 sequences. (Running on oeis4.)