A203767 v(n+1)/v(n), where v=A203766.

2, 25, 200, 16900, 304200, 72250000, 2312000000, 1104760757776, 55238037888800, 44628759527040000, 3213270685946880000, 3948896391660025000000, 386991846382682450000000, 673918119287694361600000000

Offset

1,1

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..14.

Mathematica

f[j_] := Floor[(j + 1)/2]; z = 16;
u := Product[f[j]^2 + f[k]^2, {j, 1, k - 1}]
v[n_] := Product[u, {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203766 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203767 *)

Crossrefs

Sequence in context: A361874 A215298 A094218 * A206392 A074438 A068176

Adjacent sequences: A203764 A203765 A203766 * A203768 A203769 A203770

Keyword

nonn

Author

Clark Kimberling, Jan 05 2012

Status

approved