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 A373060 #9 May 21 2024 08:47:23
%S A373060 1,11,43,115,221,473,631,1139,1609,2431,2531,4945,4213,6941,9503,
%T A373060 10867,9521,17699,13339,25415,27133,27841,23783,48977,39721,46343,
%U A373060 55555,72565,47909,104533,58591,100979,108833,104731,139451,185035,99901,146729,181159,251719
%N A373060 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, n)/gcd(x_1, x_2, x_3, n).
%H A373060 Seiichi Manyama, <a href="/A373060/b373060.txt">Table of n, a(n) for n = 1..200</a>
%o A373060 (PARI) a(n) = sum(i=1, n, sum(j=1, n, sum(k=1, n, gcd(i, n)/gcd([i, j, k, n]))));
%Y A373060 Cf. A372952, A373061.
%K A373060 nonn,mult
%O A373060 1,2
%A A373060 _Seiichi Manyama_, May 21 2024