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A203685 Vandermonde sequence using x^2 + xy + y^2 applied to (1,2,6,...,n!). 4

%I #7 Jan 14 2013 10:19:07

%S 1,7,15652,4466072310336,257010442859540072735404130304,

%T 12039114411811108434329752218564963041089979745446343475200

%N Vandermonde sequence using x^2 + xy + y^2 applied to (1,2,6,...,n!).

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

%t f[j_] := j!; z = 8;

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

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

%t v[n_] := Product[u[n], {k, 2, n}]

%t Table[v[n], {n, 1, z}] (* A203685 *)

%t Table[v[n + 1]/v[n], {n, 1, z}] (* A203686 *)

%K nonn

%O 1,2

%A _Clark Kimberling_, Jan 04 2012

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Last modified March 3 06:28 EST 2024. Contains 370499 sequences. (Running on oeis4.)