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 A349117 #8 Nov 08 2021 09:11:05
%S A349117 1,7,49,445,5266,77258,1349554,27306462,627568355,16142172173,
%T A349117 459332766227,14324480721391,485783513552956,17798331858727376,
%U A349117 700589353757045796,29484907446960975744,1321168518044435497005,62795290373559355285155,3155553461189975793914005
%N A349117 a(n) = Sum_{m=1..n} (Sum_{k=1..m} (Sum_{j=1..k} j^k)).
%H A349117 Vaclav Kotesovec, <a href="/A349117/b349117.txt">Table of n, a(n) for n = 1..200</a>
%F A349117 a(n) ~ c * n^n, where c = 1/(1 - 1/exp(1)) = A185393 = 1/A068996 = 1.581976706...
%t A349117 Table[Sum[Sum[Sum[j^k, {j, 1, k}], {k, 1, m}], {m, 1, n}], {n, 1, 20}]
%Y A349117 Cf. A086787, A349116.
%K A349117 nonn
%O A349117 1,2
%A A349117 _Vaclav Kotesovec_, Nov 08 2021