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A203690 v(n+1)/v(n), where v=A203689. 2
5, 1480, 204811920, 44845458424326144, 38524837563190678680163123200, 274281830629678279850073754564550983680000000, 30490404582529065278831553253825833486757227887272069693440000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A093883 for a discussion and guide to related sequences.

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

f[j_] := j!; z = 8;

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

v[n_] := Product[u[n], {k, 2, n}]

Table[v[n], {n, 1, z}] (* A203689 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203690 *)

CROSSREFS

Sequence in context: A332536 A172920 A062598 * A304425 A316280 A305959

Adjacent sequences: A203687 A203688 A203689 * A203691 A203692 A203693

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 04 2012

STATUS

approved

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Last modified November 29 18:13 EST 2022. Contains 358431 sequences. (Running on oeis4.)