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 A203232 #7 Oct 15 2013 14:16:47
%S A203232 1,5,16,60,156,540,1296,4320,9936,32400,72576,233280,513216,1632960,
%T A203232 3545856,11197440,24074496,75582720,161243136,503884800,1068235776,
%U A203232 3325639680,7014076416,21767823360,45712429056,141490851840
%N A203232 (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (2,3,2,3,2,3,...).
%F A203232 Conjecture: a(n)=12*a(n-2)-36*a(n-4) with G.f. x*(1+x)*(4*x+1) / (-1+6*x^2)^2 . - _R. J. Mathar_, Oct 15 2013
%t A203232 r = {2, 3, 2, 3, 2, 3};
%t A203232 s = Flatten[{r, r, r, r, r, r, r, r, r}];
%t A203232 t[n_] := Part[s, Range[n]]
%t A203232 a[n_] := SymmetricPolynomial[n - 1, t[n]]
%t A203232 Table[a[n], {n, 1, 32}] (* A203232 *)
%Y A203232 Cf. A203233.
%K A203232 nonn
%O A203232 1,2
%A A203232 _Clark Kimberling_, Dec 30 2011