OFFSET
1,2
EXAMPLE
a(6) = 1! 2! 3! 6! = 8640 because 1, 2, 3 and 6 are the positive divisors of 6.
MATHEMATICA
Table[z = 1; For[i = 1, i ? n, i++, If[Mod[n, i] == 0, z = z*i! ]]; z, {n, 1, 20}] (Handler)
Table[Product[k!, {k, Divisors[n]}], {n, 1, 20}] (* Vaclav Kotesovec, Sep 07 2019 *)
PROG
(PARI) a(n) = my(p=1); fordiv(n, d, p *= d!); p; \\ Michel Marcus, Sep 07 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Sep 28 2004
EXTENSIONS
More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Nov 15 2004
More terms from Michel Marcus, Sep 07 2019
STATUS
approved