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 A259696 #13 May 09 2022 02:45:36
%S A259696 0,1,771,28552,540563,3830364,29209978,119337536,490114881,1659932478,
%T A259696 4961414965,12516905184,33139873949,77515802840,156374512326,
%U A259696 344012784128,669604434612,1292506329141,2292202227639,4210108803824,6929184038448,12639642518772,19287324979742,32384260599552
%N A259696 a(n) = Sum_{k=1..n-1} k^8*sigma(k)*sigma(n-k).
%C A259696 This was formerly A001481.
%H A259696 Colin Barker, <a href="/A259696/b259696.txt">Table of n, a(n) for n = 1..1000</a>
%H A259696 J. Touchard, <a href="/A000385/a000385.pdf">On prime numbers and perfect numbers</a>, Scripta Math., 129 (1953), 35-39. [Annotated scanned copy]
%p A259696 S:=(n,e)->add(k^e*sigma(k)*sigma(n-k),k=1..n-1); f:=e->[seq(S(n,e),n=1..30)]; f(8);
%o A259696 (PARI) a(n) = sum(k=1, n-1, k^8*sigma(k)*sigma(n-k)) \\ _Colin Barker_, Jul 16 2015
%Y A259696 Cf. A000385, A000441, A000477, A000499, A259692, A259693, A259694, A259695.
%K A259696 nonn
%O A259696 1,3
%A A259696 _N. J. A. Sloane_, Jul 03 2015