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 A336955 #12 Aug 09 2020 03:29:34
%S A336955 1,2,9,73,849,12651,228493,4836301,117204545,3196763983,96842596701,
%T A336955 3224356269597,116981406934417,4591908332288837,193846634326107701,
%U A336955 8755364023207809301,421214258699748184321,21500563181275847468503,1160430732790051008442141,66020998289431649938896445
%N A336955 a(n) = Sum_{k=0..n} k^k * binomial(n, k)^2.
%t A336955 a[n_] := 1 + Sum[k^k * Binomial[n, k]^2, {k, 1, n}]; Array[a, 20, 0] (* _Amiram Eldar_, Aug 09 2020 *)
%o A336955 (PARI) {a(n) = sum(k=0, n, k^k*binomial(n, k)^2)}
%Y A336955 Cf. A037966, A037972, A086331, A329913, A329444, A336828.
%K A336955 nonn
%O A336955 0,2
%A A336955 _Seiichi Manyama_, Aug 09 2020