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 A344508 #15 May 29 2021 09:32:42
%S A344508 1,6,24,64,175,270,686,928,1647,2150,4356,3792,8619,8526,11250,14592,
%T A344508 25721,19926,40432,31200,44835,53966,87814,58272,108125,106470,132678,
%U A344508 124656,224547,132750,294066,232960,284229,316166,372400,291168,600991,496014,560742,484000,909421,531846
%N A344508 a(n) = Sum_{k=1..n} k * lcm(k,n).
%H A344508 Vaclav Kotesovec, <a href="/A344508/b344508.txt">Table of n, a(n) for n = 1..10000</a>
%F A344508 Sum_{k=1..n} a(k) ~ 2 * zeta(3) * n^5 / (5*Pi^2). - _Vaclav Kotesovec_, May 29 2021
%t A344508 a[n_] := Sum[k * LCM[k, n], {k, 1, n}]; Array[a, 50] (* _Amiram Eldar_, May 21 2021 *)
%o A344508 (PARI) a(n) = sum(k=1, n, k*lcm(k, n));
%Y A344508 Cf. A051193, A057660, A344509, A344510.
%K A344508 nonn
%O A344508 1,2
%A A344508 _Seiichi Manyama_, May 21 2021