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 A203195 #7 Oct 01 2016 12:15:36
%S A203195 1,2,5,27,388,16436,2175432,934036488,1336005150480,6496133192508960,
%T A203195 109111368146935714560,6414259771390908431554560,
%U A203195 1334245289372299128934618629120,991211300949703256415518451506380800
%N A203195 (n-1)-st elementary symmetric function of the first n Catalan numbers (A000108).
%t A203195 f[k_] := (1/k) Binomial[2 k - 2, k - 1];
%t A203195 t[n_] := Table[f[k], {k, 1, n}]
%t A203195 a[n_] := SymmetricPolynomial[n - 1, t[n]]
%t A203195 Table[a[n], {n, 1, 14}] (* A203195 *)
%Y A203195 Cf. A000108, A003046 (n-th elem. symm. func.), A014137 (1st elm. symm. func.).
%K A203195 nonn
%O A203195 1,2
%A A203195 _Clark Kimberling_, Dec 30 2011