A203582 v(n+1)/v(n), where v=A203581.

19, 1036, 116571, 22656816, 6814202907, 2944470267648, 1733264443684683, 1335544723529452800, 1305986008348685022723, 1581171893218923245420544, 2322926322016811685175726011, 4072369789139269227339542851584

Offset: 1

Author

Clark Kimberling, Jan 04 2012

Keywords

• nonn

Comments

See A093883 for a discussion and guide to related sequences.

Programs

Mathematica

f[j_] := j + 1; z = 12;
v[n_] := Product[Product[f[j]^2 + f[j] f[k] + f[k]^2,
{j, 1, k - 1}], {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203581 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203582 *)