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 A203766 Vandermonde sequence using x^2 + y^2 applied to (1,1,2,2,...,floor(n/2)). 3
 1, 2, 50, 10000, 169000000, 51409800000000, 3714358050000000000000, 8587595811600000000000000000000, 9487238856297219731001600000000000000000000, 524056459404241401975165324773422080000000000000000000000 (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..10. MATHEMATICA f[j_] := Floor[(j + 1)/2]; z = 16; u := Product[f[j]^2 + f[k]^2, {j, 1, k - 1}] v[n_] := Product[u, {k, 2, n}] Table[v[n], {n, 1, z}] (* A203766 *) Table[v[n + 1]/v[n], {n, 1, z}] (* A203767 *) CROSSREFS Sequence in context: A210919 A210924 A355629 * A197487 A080293 A084107 Adjacent sequences: A203763 A203764 A203765 * A203767 A203768 A203769 KEYWORD nonn AUTHOR Clark Kimberling, Jan 05 2012 STATUS approved

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Last modified October 1 11:17 EDT 2023. Contains 365826 sequences. (Running on oeis4.)