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 A306377 #11 Mar 10 2019 14:52:46
%S A306377 1,7,72,934,14511,263197,5468126,128156252,3346505197,96372936395,
%T A306377 3034801313116,103751149938746,3827141124879891,151520483911293537,
%U A306377 6408792648508559714,288419881116435604320,13761208522825454943617,693870384974027681319231
%N A306377 a(n) = n^(n+1) - Sum_{k=1..n-1} k^(k+1).
%F A306377 a(n) = 2*A007778(n) - A062815(n).
%e A306377 a(5) = 5^6 - 4^5 - 3^4 - 2^3 - 1^2 = 14511.
%o A306377 (PARI) a(n) = n^(n+1) - sum(k=1, n-1, k^(k+1)); \\ _Michel Marcus_, Feb 11 2019
%Y A306377 Cf. A007778, A062815.
%K A306377 nonn
%O A306377 1,2
%A A306377 _Kritsada Moomuang_, Feb 11 2019