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A203767 v(n+1)/v(n), where v=A203766. 2
2, 25, 200, 16900, 304200, 72250000, 2312000000, 1104760757776, 55238037888800, 44628759527040000, 3213270685946880000, 3948896391660025000000, 386991846382682450000000, 673918119287694361600000000 (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..14.

MATHEMATICA

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

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

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

Table[v[n], {n, 1, z}]          (* A203766 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203767 *)

CROSSREFS

Sequence in context: A220276 A215298 A094218 * A206392 A074438 A068176

Adjacent sequences:  A203764 A203765 A203766 * A203768 A203769 A203770

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 05 2012

STATUS

approved

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Last modified April 6 08:53 EDT 2020. Contains 333268 sequences. (Running on oeis4.)