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A203765 Square root of A203764(n). 3
1, 3, 6, 49, 147, 2028, 8112, 159201, 796005, 20342448, 122054688, 3850078401, 26950548807, 1012487793408, 8099902347264, 353293863908769, 3179644775178921, 157973407966483200, 1579734079664832000, 88087149666575064369 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

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

Cf. A093883.

Sequence in context: A197884 A279706 A032322 * A111752 A102931 A056447

Adjacent sequences:  A203762 A203763 A203764 * A203766 A203767 A203768

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 05 2012

STATUS

approved

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Last modified May 25 01:24 EDT 2019. Contains 323534 sequences. (Running on oeis4.)