a(n) = Product_{k=1..n} sigma(k); sigma(k) is the sum of the positive divisors of n.
A066780
a(n) = Product_{k=1..n} sigma(k); sigma(k) is the sum of the positive divisors of n.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =84a(4) =504a(5) =6048a(6) =48384a(7) =725760a(8) =9434880a(9) =169827840a(10) =2037934080a(11) =57062154240a(12) =798870159360
External references
- oeis: A066780