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A203480 v(n+1)/v(n), where v=A203479. 3
4, 80, 6336, 1901824, 2167925760, 9505110118400, 162323441859870720, 10902076148767162433536, 2898720791385603198124032000, 3064112360434477703904869089280000, 12909951234577776926559241120412860416000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

f[j_] := 2^j - 1; z = 15;

v[n_] := Product[Product[f[k] + f[j], {j, 1, k - 1}], {k, 2, n}]

Table[v[n], {n, 1, z}]                  (* A203479 *)

Table[v[n + 1]/v[n], {n, 1, z - 1}]     (* A203480 *)

Table[v[n + 1]/(4 v[n]), {n, 1, z - 1}] (* A203481 *)

CROSSREFS

Cf. A203479, A203307, A093883.

Sequence in context: A012106 A156103 A204294 * A339854 A116189 A159063

Adjacent sequences:  A203477 A203478 A203479 * A203481 A203482 A203483

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 02 2012

STATUS

approved

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Last modified October 2 20:53 EDT 2022. Contains 357230 sequences. (Running on oeis4.)