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 A343425 #28 Jan 22 2022 12:53:56
%S A343425 1,1,5,44,474,6259,98398,1801784,37726398,889909001,23363492888,
%T A343425 675898131588,21367308429609,732952005073611,27116443849927291,
%U A343425 1076343749563379984,45629840631648951966,2057705657634136459302,98357762859847238180913
%N A343425 a(n) = Sum_{k=1..n} mu(k) * n^(n - k).
%H A343425 Seiichi Manyama, <a href="/A343425/b343425.txt">Table of n, a(n) for n = 1..387</a>
%t A343425 a[n_] := Sum[MoebiusMu[k] * n^(n-k), {k,1,n}]; Array[a, 20] (* _Amiram Eldar_, May 19 2021 *)
%o A343425 (PARI) a(n) = sum(k=1, n, moebius(k)*n^(n-k));
%Y A343425 Cf. A292524, A344431, A344432, A344433.
%K A343425 nonn
%O A343425 1,3
%A A343425 _Seiichi Manyama_, May 19 2021