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 A195130 #21 Oct 24 2015 23:28:12 %S A195130 1,24,852,35744,1645794,80415216,4094489992,214888573248, %T A195130 11542515402255,631467591949480,35063515239394764,1971043639046131296, %U A195130 111949770626330347638,6414671157989386260432,370360217892318010055832 %N A195130 Series inversion of A100130. %H A195130 Michael Somos, <a href="/A195130/b195130.txt">Table of n, a(n) for n = 1..16</a> %F A195130 A005149(n) = -(-1)^n * a(n). %e A195130 G.f. = q + 24*q^2 + 852*q^3 + 35744*q^4 + 1645794*q^5 + 80415216*q^6 + ... %t A195130 a[ n_] := If[ n < 1, 0, SeriesCoefficient[ InverseSeries[ Series[ q / QPochhammer[ -q, q^2]^24, {q, 0, n}], q], {q, 0, n}]]; %o A195130 (PARI) {a(n) = if( n<1, 0, polcoeff( serreverse( x * prod( k=1, n, 1 + (-x)^k, 1 + x * O(x^n) )^24), n))}; %Y A195130 Cf. A005149, A100130. %K A195130 nonn %O A195130 1,2 %A A195130 _Michael Somos_, Sep 11 2011