%I #6 Dec 20 2014 16:23:39
%S 2,259,158268,269187906,978285792294,6507711545263297,
%T 71556972889550923184,1209737575506373416337924,
%U 29788382281118324885770212522,1024436101844282730312688949278959,47581802360081733847924522879325619588,2904105920298407789174888476843692390201446
%N Sum_{k=0..n} k^(n+k)*(n+k)^k.
%F a(n) ~ 2^n * n^(3*n). - _Vaclav Kotesovec_, Dec 20 2014
%t Table[Sum[k^(n+k)*(n+k)^k, {k, 0, n}], {n, 1, 12}]
%Y Cf. A062817, A252709, A252710.
%K nonn,easy
%O 1,1
%A _Vaclav Kotesovec_, Dec 20 2014
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