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 A203686 a(n) = v(n+1)/v(n), where v=A203685. 2
 7, 2236, 285335568, 57547308910500864, 46842899758710033145621708800, 322220837658676800986885694521836421775360000, 34986707114505659359711247628604631290356811281951514165248000000 (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[j] f[k] + f[k]^2, {j, 1, k - 1}] v[n_] := Product[u[n], {k, 2, n}] Table[v[n], {n, 1, z}] (* A203685 *) Table[v[n + 1]/v[n], {n, 1, z}] (* A203686 *) CROSSREFS Cf. A203685. Sequence in context: A125538 A129732 A186164 * A248142 A216472 A065505 Adjacent sequences: A203683 A203684 A203685 * A203687 A203688 A203689 KEYWORD nonn,easy AUTHOR Clark Kimberling, Jan 04 2012 EXTENSIONS Definition corrected by Georg Fischer, Nov 25 2021 STATUS approved

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Last modified September 27 07:56 EDT 2023. Contains 365674 sequences. (Running on oeis4.)