1,3

a(n) = A050320(A000142(n)).

Index entries for sequences related to factorial numbers.

n=5, 5! = 1*2*3*4*5 = 120 = 2 * 2 * 2 * 3 * 5: a(5)=#{2*2*2*3*5,2*2*2*15,2*2*6*5,2*2*30,2*2*3*10,2*6*10}=6.

Cf. A103775.

Sequence in context: A014113 A078008 A076907 this_sequence A036052 A091764 A079005

Adjacent sequences: A103771 A103772 A103773 this_sequence A103775 A103776 A103777

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Feb 15 2005