A203582 - OEIS

%I #7 Jan 14 2013 04:31:18

%S 19,1036,116571,22656816,6814202907,2944470267648,1733264443684683,

%T 1335544723529452800,1305986008348685022723,1581171893218923245420544,

%U 2322926322016811685175726011,4072369789139269227339542851584

%N v(n+1)/v(n), where v=A203581.

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

%t f[j_] := 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}]          (* A203581 *)

%t Table[v[n + 1]/v[n], {n, 1, z}] (* A203582 *)

%K nonn

%O 1,1

%A _Clark Kimberling_, Jan 04 2012