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A203316
a(n) = v(n+1)/(2*v(n)), where v=A203315.
3
1, 4, 96, 480, 20160, 129024, 8294400, 1423319040, 8453652480, 2463635865600, 89117289676800, 660834091008000, 63038756487168000, 20712734274355200000, 4023397460155878604800, 27460572284725493760000
OFFSET
1,2
MATHEMATICA
f[j_] := Prime[j + 1]; z = 17;
v[n_] := Product[Product[f[k] - f[j], {j, 1, k - 1}], {k, 2, n}]
d[n_] := Product[(i - 1)!, {i, 1, n}]
Table[v[n], {n, 1, z}] (* A203315 *)
Table[v[n + 1]/(2 v[n]), {n, 1, z - 1}] (* A203316 *)
Table[v[n]/d[n], {n, 1, 20}] (* A203317 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 01 2012
EXTENSIONS
Definition corrected by Georg Fischer, Nov 26 2021
STATUS
approved