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 A023539 #11 Jul 18 2021 03:15:37
%S A023539 4,14,32,59,96,145,208,286,380,492,624,777,952,1151,1375,1625,1902,
%T A023539 2207,2542,2909,3309,3743,4212,4717,5260,5842,6464,7128,7836,8589,
%U A023539 9388,10235,11131,12077,13074,14123,15226,16384,17598,18869,20198
%N A023539 Convolution of natural numbers with composite numbers.
%H A023539 Seiichi Manyama, <a href="/A023539/b023539.txt">Table of n, a(n) for n = 1..10000</a>
%e A023539 a(1) = 1*4 = 4;
%e A023539 a(2) = 1*6 + 2*4 = 14;
%e A023539 a(3) = 1*8 + 2*6 + 3*4 = 32;
%o A023539 (PARI) lista(nn) = {my(vc = []); forcomposite(n=2, nn, vc = concat(vc, n); print1(sum(k=1, #vc, (#vc-k+1)*vc[k]), ", "););} \\ _Michel Marcus_, Feb 11 2018
%Y A023539 Cf. A002808.
%Y A023539 First differences are in A053767.
%K A023539 nonn
%O A023539 1,1
%A A023539 _Clark Kimberling_