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 A348144 #6 Oct 03 2021 10:38:40
%S A348144 1,20,19710,4295033088,298023223876956250,
%T A348144 10314424798490637108305446464,
%U A348144 256923577521058878088611477224235622145150,6277101735386680763835789423286894578616620063532571951104,196627050475552913618075908526912116283103450944214825077052418578026469007467
%N A348144 a(n) = Sum_{d|n} n^(n^2/d).
%t A348144 Table[Sum[n^(n^2/i)*(1 - Ceiling[n/i] + Floor[n/i]), {i, n}], {n, 10}]
%o A348144 (PARI) a(n) = sumdiv(n, d, n^(n^2/d)); \\ _Michel Marcus_, Oct 03 2021
%Y A348144 Cf. A066108, A308593.
%K A348144 nonn
%O A348144 1,2
%A A348144 _Wesley Ivan Hurt_, Oct 02 2021