A203760 v(n+1)/v(n), where v=A203759.

3, 49, 588, 61009, 1647243, 473323536, 22719529728, 13058834917401, 979412618805075, 949149594515775744, 102508156207703780352, 150861990726485797358601, 22176712636793412211714347

Offset

1,1

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..13.

Mathematica

f[j_] := Floor[(j + 1)/2]; z = 13;
u := Product[f[j]^2 + f[j] f[k] + f[k]^2, {j, 1, k - 1}]
v[n_] := Product[u, {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203759 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203760 *)

Crossrefs

Sequence in context: A167601 A061185 A182279 * A208935 A355882 A202534

Adjacent sequences: A203757 A203758 A203759 * A203761 A203762 A203763

Keyword

nonn

Author

Clark Kimberling, Jan 05 2012

Status

approved