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 A368561 #9 Jan 13 2024 06:26:36
%S A368561 1,2,11,184,6565,390806,34557919,4237440628,687219772553,
%T A368561 142347286888210,36654963132246211,11483715014356017104,
%U A368561 4300711472638444724653,1897241450053063830832078,973695564434830963964311655
%N A368561 a(n) = Sum_{k=0..n} k! * n^k.
%F A368561 a(n) ~ n! * n^n. - _Vaclav Kotesovec_, Jan 13 2024
%o A368561 (PARI) a(n) = sum(k=0, n, k!*n^k);
%Y A368561 Cf. A058006, A112368, A112370, A112541.
%K A368561 nonn,easy
%O A368561 0,2
%A A368561 _Seiichi Manyama_, Dec 30 2023