A203682 v(n+1)/v(n), where v=A203681.

3, 156, 142272, 2194403328, 557834881204224, 2303742029718154641408, 153403122389516451861994930176, 164074442468721024925743366747249967104, 2813282786110268238357922727341801514160674045952

Offset

1,1

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..9.

Mathematica

f[j_] := 2^(j - 1); z = 12;
u[n_] := Product[f[j]^2 - f[j] f[k] + f[k]^2,
{j, 1, k - 1}]
v[n_] := Product[u[n], {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203681 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203682 *)

Crossrefs

Sequence in context: A327058 A087306 A278877 * A316479 A139964 A048797

Adjacent sequences: A203679 A203680 A203681 * A203683 A203684 A203685

Keyword

nonn

Author

Clark Kimberling, Jan 04 2012

Status

approved