A203585 Vandermonde sequence using x^2 + y^2 applied to (2,3,...,n+1).

1, 13, 6500, 262769000, 1500305882400000, 1885591784499143760000000, 753074404854223679800035840000000000, 130639388303516205847055577677763494400000000000000

Offset

1,2

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..8.

Mathematica

f[j_] := j + 1; z = 12;
v[n_] := Product[Product[f[j]^2 + f[k]^2, {j, 1, k - 1}], {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203585 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203586 *)

Crossrefs

Sequence in context: A373884 A032463 A298273 * A191937 A210157 A213410

Adjacent sequences: A203582 A203583 A203584 * A203586 A203587 A203588

Keyword

nonn

Author

Clark Kimberling, Jan 04 2012

Status

approved