A203682 - OEIS

A203682

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

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

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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