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 A120288 #2 Mar 31 2012 13:20:27
%S A120288 1,33,2033,87425,11440331,82653347,58026230977,472474237481,
%T A120288 38806560342253,431701520479427,579954645879123307,
%U A120288 7598398013722878661,16804804720323979155637,16901141697896969645401
%N A120288 Numerator of 1/n^4 + 2/(n-1)^4 + 3/(n-2)^4 +...+ (n-1)/2^4 + n.
%C A120288 p^2 divides a(p-1) for prime p>3. p divides a(p-2) for prime p>5.
%F A120288 a(n) = numerator[Sum[Sum[1/i^4,{i,1,k}],{k,1,n}]].
%t A120288 Numerator[Table[Sum[Sum[1/i^4,{i,1,k}],{k,1,n}],{n,1,20}]]
%Y A120288 Cf. A001008, A007406, A007407, A007408, A007410.
%K A120288 frac,nonn
%O A120288 1,2
%A A120288 _Alexander Adamchuk_, Jul 07 2006