A203765 Square root of A203764(n).

1, 3, 6, 49, 147, 2028, 8112, 159201, 796005, 20342448, 122054688, 3850078401, 26950548807, 1012487793408, 8099902347264, 353293863908769, 3179644775178921, 157973407966483200, 1579734079664832000, 88087149666575064369

Offset: 1

Author

Clark Kimberling, Jan 05 2012

Keywords

• nonn

Crossrefs

Cf. A093883.

Programs

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 *)