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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..11.

MATHEMATICA

Join[{0}, Table[2*(Prime[n] - 1)!/(Prime[n] + 1), {n, 2, 15}]] (* Stefan Steinerberger, Jul 16 2007 *)

CROSSREFS

Sequence in context: A221589 A317486 A060593 * A332118 A261825 A203359

Adjacent sequences:  A130772 A130773 A130774 * A130776 A130777 A130778

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

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Last modified September 27 19:04 EDT 2020. Contains 337388 sequences. (Running on oeis4.)