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A203696 v(n+1)/v(n), where v=A203695. 2
10, 1665, 1497224, 4485885300, 34184139841800, 557745681594010000, 17295475176752223859200, 934164847784800073360250000, 82223581117536608232019062500000, 11191248877703366469751902789287961600 (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..10.

MATHEMATICA

f[j_] := j (j + 1)/2; z = 11;

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}]          (* A203695 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203696 *)

CROSSREFS

Sequence in context: A160236 A204466 A117523 * A203530 A232594 A194793

Adjacent sequences:  A203693 A203694 A203695 * A203697 A203698 A203699

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 04 2012

STATUS

approved

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Last modified August 16 07:50 EDT 2022. Contains 356160 sequences. (Running on oeis4.)