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 A145074 #12 Mar 30 2012 18:39:36
%S A145074 1,3,12,97,885,10386,141295,2218987,39171564,770029605,16652860169,
%T A145074 393052609026,10051000032099,276818387211471,8168772682637220,
%U A145074 257133140827399753
%N A145074 Coefficient of x^(4^n) in Q(x)^(n+1) where Q(x) = Sum_{k>=0} (x^(4^k) + x^(2*4^k) + x^(3*4^k)).
%o A145074 (PARI) {a(n,q=4)=local(Q=sum(j=0,n,(x^(q^j)-x^(q*q^j))/(1-x^(q^j)+O(x^(q^n+1)))));polcoeff(Q^(n+1),q^n)}
%Y A145074 Cf. A007178, A145073, A145075, A145076.
%K A145074 more,nonn
%O A145074 0,2
%A A145074 _Paul D. Hanna_, Oct 09 2008
%E A145074 a(8)-a(10) from _Sean A. Irvine_, Mar 31 2011
%E A145074 a(11)-a(15) from _Max Alekseyev_, Dec 19 2011