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 A245240 #13 Jul 15 2014 18:06:18
%S A245240 0,1,-1,1,0,-5,21,-59,117,-95,-484,3131,-11219,28216,-40975,-49778,
%T A245240 630853,-2758309,8205948,-16014181,3933569,135111669,-743995720,
%U A245240 2566032656,-6105683945,6584104436,26402611080,-205994058892,825490609412,-2295266373781
%N A245240 Coefficients of the series reversion of the series Sum(x^k for k in A008578).
%F A245240 G.f.: series reversion of Sum(x^k for k in A008578) = x + Sum(x^n, n is prime).
%e A245240 x - x^2 + x^3 - 5*x^5 + 21*x^6 + ...
%t A245240 With[{N = 10}, CoefficientList[InverseSeries[x + Sum[x^Prime[k], {k, 1, N}] + O[x]^(Prime[N + 1] - 1)], x]]
%o A245240 (PARI) t=Ser(x+O(x^31)); forprime(p=2,30,t+=x^p); Vec(serreverse(t)) /* _Max Alekseyev_, Jul 15 2014 */
%Y A245240 Cf. A008578, A080339.
%K A245240 sign,easy
%O A245240 0,6
%A A245240 _Arsenii Abdrafikov_, Jul 14 2014