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 A203673 Vandermonde sequence using x^2 + xy + y^2 applied to (1,4,9,...,n^2). 3
 1, 21, 254163, 11213968422384, 6451450005117349260375984, 127857993263632065817610313129228311433216, 191199773886534869435599958788731398661833328276349525268803584 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See A093883 for a discussion and guide to related sequences. LINKS 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}]          (* A203673 *) Table[v[n + 1]/v[n], {n, 1, z}] (* A203674 *) CROSSREFS Sequence in context: A172800 A013768 A182149 * A172854 A143736 A189252 Adjacent sequences:  A203670 A203671 A203672 * A203674 A203675 A203676 KEYWORD nonn AUTHOR Clark Kimberling, Jan 04 2012 STATUS approved

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Last modified May 20 01:43 EDT 2013. Contains 225445 sequences.