A120066 - OEIS

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A120066

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

0

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

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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

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