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 A068338 #14 May 14 2025 09:06:38
%S A068338 1,3,23,368,8624,324864,15399936,985595904,79833268224,8115008716800,
%T A068338 968747865292800,139499692602163200,23346005516963020800,
%U A068338 4614592869368384716800,1045883450064438558720000,267746163216496271032320000,76940878032870027275796480000
%N A068338 a(n) = n!^2 * Sum_{k=1..n} mu(k)/k^2, where mu(k) is the Moebius function.
%H A068338 John Tyler Rascoe, <a href="/A068338/b068338.txt">Table of n, a(n) for n = 1..100</a>
%o A068338 (PARI)
%o A068338 A068338(n) = {n!^2 * sum(k=1,n,moebius(k)/k^2)} \\ _John Tyler Rascoe_, May 14 2025
%Y A068338 Cf. A008683, A068101, A068107, A068340.
%K A068338 nonn
%O A068338 1,2
%A A068338 _Leroy Quet_, Feb 27 2002
%E A068338 a(16) onwards from _John Tyler Rascoe_, May 14 2025