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 A203164 #7 Oct 15 2013 14:45:27
%S A203164 1,5,14,50,224,320,736,2400,10176,12480,27264,86400,359424,414720,
%T A203164 884736,2764800,11390976,12718080,26763264,82944000,339738624,
%U A203164 371589120,775028736,2388787200,9746251776,10510663680,21785739264,66886041600
%N A203164 (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (4,1,2,3,4,1,2,3,...).
%F A203164 Conjecture: a(n)=48*a(n-4)-576*a(n-8) with G.f. x*(1+5*x+14*x^2+50*x^3+176*x^4+80*x^5+64*x^6) / (-1+24*x^4)^2. - _R. J. Mathar_, Oct 15 2013
%t A203164 f[k_] := 1 + Mod[k + 2, 4];
%t A203164 t[n_] := Table[f[k], {k, 1, n}]
%t A203164 a[n_] := SymmetricPolynomial[n - 1, t[n]]
%t A203164 Table[a[n], {n, 1, 33}] (* A203164 *)
%Y A203164 Cf. A010883, A203162, A203163, A203165.
%K A203164 nonn
%O A203164 1,2
%A A203164 _Clark Kimberling_, Dec 30 2011