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 A203532 #8 Jan 14 2013 08:51:37 %S A203532 10,168,3315,76608,2661120,113667840,4311354600,178738560000, %T A203532 11178747740160,791853627801600,44783640216315000,2693449157020876800, %U A203532 246209683227475968000,17126298576096297588000,1253392853589570355200000 %N A203532 v(n+1)/v(n), where v=A203530. %t A203532 t = Table[If[PrimeQ[k], 0, k], {k, 1, 100}]; %t A203532 composite = Rest[Rest[Union[t]]] (* A002808 *) %t A203532 f[j_] := composite[[j]]; z = 20; %t A203532 v[n_] := Product[Product[f[k] + f[j], {j, 1, k - 1}], {k, 2, n}] %t A203532 d[n_] := Product[(i - 1)!, {i, 1, n}] (* A000178 *) %t A203532 Table[v[n], {n, 1, z}] (* A203530 *) %t A203532 Table[v[n + 1]/v[n], {n, 1, z - 1}] (* A203532 *) %t A203532 Table[v[n]/d[n], {n, 1, 20}] (* A203533 *) %Y A203532 Cf. A203530, A203532, A002808, A093883, A203419. %K A203532 nonn %O A203532 1,1 %A A203532 _Clark Kimberling_, Jan 03 2012