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 A377677 #11 Nov 04 2024 01:36:35 %S A377677 3,60,728,10416,116064,2837120,36990720,1452853584,27615698352, %T A377677 965243666880,23861701899840,1355882884941312,20758574413420992, %U A377677 1604569397488307712,93340493714183159808,3135286584767445151680,90560273718863022770592,8284620870197084160000000 %N A377677 a(n) is the sum of the divisors of n^n - n. %H A377677 Amiram Eldar, <a href="/A377677/b377677.txt">Table of n, a(n) for n = 2..115</a> %F A377677 a(n) = A000203(A061190(n)). %t A377677 a[n_] := DivisorSigma[1, n^n - n]; Array[a, 20, 2] (* _Amiram Eldar_, Nov 04 2024 *) %o A377677 (PARI) a(n) = sigma(n^n-n); %Y A377677 Cf. A000203, A061190, A366819, A377673, A377675, A377676, A377678. %K A377677 nonn %O A377677 2,1 %A A377677 _Sean A. Irvine_, Nov 03 2024