This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A368492 #9 Dec 27 2023 07:44:00
%S A368492 1,1,17,762,67788,10034459,2226678977,691532161356,286302140043208,
%T A368492 152380144397396525,101369101598593980737,82415052812980817676790,
%U A368492 80402388030057940015721524,92697243086459794077519471767
%N A368492 a(n) = Sum_{k=0..n} k^(n+k).
%F A368492 G.f.: Sum_{k>=0} (k^2*x)^k / (1 - k*x).
%F A368492 a(n) ~ n^(2*n). - _Vaclav Kotesovec_, Dec 27 2023
%o A368492 (PARI) a(n) = sum(k=0, n, k^(n+k));
%Y A368492 Cf. A026898, A031971.
%K A368492 nonn,easy
%O A368492 0,3
%A A368492 _Seiichi Manyama_, Dec 27 2023