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A203158 v(n+1)/v(n), where v=A203012. 2
7, 247, 21756, 3613701, 974243088, 388409565699, 214946329538304, 157727064375306153, 148245464311769260800, 173696139110375108022159, 248243987235370949531025408, 425095516929076538387157860013 (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..12.

MATHEMATICA

f[j_] := j; z = 12;

v[n_] := Product[Product[f[j]^2 + f[j] f[k] + f[k]^2,

{j, 1, k - 1}], {k, 2, n}]

Table[v[n], {n, 1, z}]          (* A203012 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203158 *)

CROSSREFS

Sequence in context: A133589 A296377 A223630 * A227414 A203698 A229482

Adjacent sequences:  A203155 A203156 A203157 * A203159 A203160 A203161

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 04 2012

STATUS

approved

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)