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A203675 Vandermonde sequence using x^2 - xy + y^2 applied to (1,4,9,...,n^2). 3
1, 13, 57889, 560058939856, 42130404012097952586256, 65111467563626175389271488157658681344, 4528499444374253250530486688998183592108605307719698157568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A093883 for a discussion and guide to related sequences.

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

f[j_] := j^2; z = 12;

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

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

Table[v[n], {n, 1, z}]          (* A203675 *)

Table[v[n + 1]/v[n], {n, 1, z}] (* A203676 *)

CROSSREFS

Sequence in context: A258670 A048917 A081317 * A189251 A188980 A022547

Adjacent sequences:  A203672 A203673 A203674 * A203676 A203677 A203678

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 04 2012

STATUS

approved

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Last modified September 20 07:32 EDT 2021. Contains 347577 sequences. (Running on oeis4.)