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A130775
a(1) = 0; for n > 1: a(n) = 2*(prime(n)-1)!/(prime(n)+1).
0
0, 1, 8, 180, 604800, 68428800, 2324754432000, 640237370572800, 93666727314800640000, 20325889640780924033433600000, 16578303738261941164769280000000
OFFSET
1,3
MATHEMATICA
Join[{0}, Table[2*(Prime[n] - 1)!/(Prime[n] + 1), {n, 2, 15}]] (* Stefan Steinerberger, Jul 16 2007 *)
CROSSREFS
Sequence in context: A360340 A374890 A060593 * A332118 A261825 A203359
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Jul 14 2007
EXTENSIONS
More terms from Stefan Steinerberger and Robert G. Wilson v, Jul 16 2007
STATUS
approved