A203583 Vandermonde sequence using x^2 - xy + y^2 applied to (2,3,...,n+1).

1, 7, 1092, 8278452, 5432386430016, 486397992095118597312, 8639860170780148341061245616128, 41813829909128704365291419329747443010781184, 72587617701933252361662389738534944047336321767596936396800

Offset

1,2

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..9.

Mathematica

f[j_] := j + 1; z = 12;
v[n_] := Product[Product[f[j]^2 - f[j] f[k] + f[k]^2,
{j, 1, k - 1}], {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203583 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203584 *)

Crossrefs

Sequence in context: A004807 A139781 A101072 * A259251 A259253 A203871

Adjacent sequences: A203580 A203581 A203582 * A203584 A203585 A203586

Keyword

nonn

Author

Clark Kimberling, Jan 04 2012

Status

approved