A120066 (n-1)! divided by (product phi(d)! ; d divides n).

1, 1, 1, 3, 1, 30, 1, 105, 28, 630, 1, 207900, 1, 12012, 45045, 675675, 1, 171531360, 1, 2618916300, 3527160, 3879876, 1, 139143023019000, 10626, 67603900, 43743700, 21925567263600, 1, 2360561385517335000, 1, 203067496256625, 14902327440

Offset

1,4

Links

Table of n, a(n) for n=1..33.

Prog

(PARI) a(n) = (n-1)! / prod(i=1, n, if(n%i==0, eulerphi(i)!, 1))

Crossrefs

Cf. A120065.

Sequence in context: A358165 A298399 A365087 * A326797 A227953 A046979

Adjacent sequences: A120063 A120064 A120065 * A120067 A120068 A120069

Keyword

nonn

Author

Martin Fuller, Jun 06 2006

Status

approved