A079303 1/(2p^2)*(p-1)!*sum(j=1,p-1,1/j) where p runs through the primes >=5.

1, 18, 43920, 4397760, 122377651200, 30993058252800, 3921055557027840000, 711860093387348628602880000, 551343268152723132127641600000, 567168796017902020698219516788736000000

Offset

3,2

Comments

Always an integer.

Links

Table of n, a(n) for n=3..12.

Formula

a(n)=A000254(A000040(n)-1)/2/A000040(n)^2

Crossrefs

Sequence in context: A255406 A123401 A201494 * A159445 A146548 A051591

Adjacent sequences: A079300 A079301 A079302 * A079304 A079305 A079306

Keyword

nonn

Author

Benoit Cloitre, Feb 09 2003

Status

approved