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 A203165 (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (3,4,1,2,3,4,1,2,...). 3

%I

%S 1,7,19,50,174,768,1056,2400,7776,32832,39744,86400,273024,1133568,

%T 1299456,2764800,8626176,35500032,39481344,82944000,256794624,

%U 1051066368,1146617856,2388787200,7357464576,30003167232,32296402944,66886041600

%N (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (3,4,1,2,3,4,1,2,...).

%F Conjecture: G.f. x*(1+7*x+19*x^2+50*x^3+126*x^4+432*x^5+144*x^6) / (-1+24*x^4)^2 with a(n) = 48*a(n-4)-576*a(n-8). - _R. J. Mathar_, Jul 02 2013

%t f[k_] := 1 + Mod[k + 1, 4];

%t t[n_] := Table[f[k], {k, 1, n}]

%t a[n_] := SymmetricPolynomial[n - 1, t[n]]

%t Table[a[n], {n, 1, 33}] (* A203165 *)

%Y Cf. A010883, A203162, A203163, A203164.

%K nonn

%O 1,2

%A _Clark Kimberling_, Dec 30 2011

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Last modified June 16 21:20 EDT 2019. Contains 324155 sequences. (Running on oeis4.)