A203771 v(n+1)/v(n), where v=A203770.

2, 289, 9248, 63266116, 10249110792, 554962779291904, 284140942997454848, 62291092000572728444176, 77863865000715910555220000, 48803803104917291287339317067776, 126499457647945619016783509839675392

Offset

1,1

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..11.

Mathematica

f[j_] := Floor[(j + 1)/2]; z = 16;
u := Product[f[j]^4 + f[k]^4, {j, 1, k - 1}]
v[n_] := Product[u, {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203770 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203771 *)

Crossrefs

Sequence in context: A065498 A296591 A296607 * A057746 A362517 A132518

Adjacent sequences: A203768 A203769 A203770 * A203772 A203773 A203774

Keyword

nonn

Author

Clark Kimberling, Jan 05 2012

Status

approved