A203514 - OEIS

%I #7 Jan 14 2013 10:12:50

%S 1,13,19747,9692360769,3007399210929125649,

%T 974293562642242789006882422237,

%U 492054106680311213790793284550789224583937187,540918035328864126384298694506545526610971072745364246025968225

%N Vandermonde sequence using x^2 + xy + y^2 applied to (1,3,5,...,2n-1).

%C See A093883 for a discussion and guide to related sequences.

%t f[j_] := 2 j - 1; z = 12;

%t v[n_] := Product[Product[f[j]^2 + f[j] f[k] + f[k]^2,

%t {j, 1, k - 1}], {k, 2, n}]

%t Table[v[n], {n, 1, z}]          (* A203514 *)

%t Table[v[n + 1]/v[n], {n, 1, z}] (* A203515 *)

%K nonn

%O 1,2

%A _Clark Kimberling_, Jan 04 2012