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A203764 v(n+1)/v(n), where v=A203763. 3
1, 9, 36, 2401, 21609, 4112784, 65804544, 25344958401, 633623960025, 413815190632704, 14897346862777344, 14823103693846716801, 726332080998489123249, 1025131531800200888254464, 65608418035212856848285696 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A093883 for a discussion and guide to related sequences.

LINKS

Table of n, a(n) for n=1..15.

MATHEMATICA

f[j_] := Floor[(j + 1)/2]; z = 16;

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

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

Table[v[n], {n, 1, z}]          (* A203763 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203764 *)

Table[Sqrt[v[n + 1]/v[n]], {n, 1, 20}]  (* A203765 *)

CROSSREFS

Sequence in context: A129425 A246757 A079655 * A053949 A071134 A116108

Adjacent sequences:  A203761 A203762 A203763 * A203765 A203766 A203767

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 05 2012

STATUS

approved

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Last modified May 20 23:05 EDT 2022. Contains 353886 sequences. (Running on oeis4.)