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A203694 v(n+1)/v(n), where v=A203693. 2
7, 837, 546364, 1193379075, 6644086647237, 79301495255509072, 1800387492184752516864, 71233673448265142887288125, 4594697931876986561881103171875, 458419756376283291989575799311713024 (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[j] f[k] + f[k]^2,

  {j, 1, k - 1}]

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

Table[v[n], {n, 1, z}]          (* A203693 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203694 *)

CROSSREFS

Sequence in context: A279120 A047788 A251698 * A269896 A087350 A308296

Adjacent sequences:  A203691 A203692 A203693 * A203695 A203696 A203697

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 04 2012

STATUS

approved

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Last modified June 20 09:27 EDT 2019. Contains 324234 sequences. (Running on oeis4.)