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 A262310 #9 Oct 04 2015 20:28:38
%S A262310 1,-1,1,-7,9,9,49,-176,57,-673,2401,1143,-9063,33201,-153502,315783,
%T A262310 -755943,2210985,-767039,1790369,-40127031,44496424,-58813391,
%U A262310 1040502519,-1696965207,-1810005816,-4483997699,7445790947,105920054242,-134133273672,-203398909151
%N A262310 a(n) = coefficient of x^(2n) in the expansion of the modular form Product_{k>=1} (1-x^k)^n.
%p A262310 C7:=proc(r) local t1,n;
%p A262310 t1:=mul((1-x^n)^r,n=1..2*r+2);
%p A262310 series(t1,x,2*r+1);
%p A262310 coeff(%,x,2*r);
%p A262310 end;
%p A262310 [seq(C7(i),i=0..30)];
%Y A262310 Bisections: A262537, A262538.
%K A262310 sign
%O A262310 0,4
%A A262310 _N. J. A. Sloane_, Oct 04 2015