1,1
Table of n, a(n) for n=1..13.
f[j_] := 1/(2 j + 2); z = 12;
v[n_] := Product[Product[f[k] - f[j], {j, 1, k - 1}], {k, 2, n}]
1/Table[v[n], {n, 1, z}] (* A203426 *)
Table[v[n]/(4 v[n + 1]), {n, 1, z - 1}] (* A203427 *)
Cf. A203426, A203425.
Sequence in context: A099852 A218382 A195635 * A199012 A201698 A003029
Adjacent sequences: A203424 A203425 A203426 * A203428 A203429 A203430
sign
Clark Kimberling, Jan 02 2012
approved
