a(n) = Product_{i=2..n} sigma(i)/bigomega(i).
A066987
a(n) = Product_{i=2..n} sigma(i)/bigomega(i).
Terms
- a(0) =3a(1) =12a(2) =42a(3) =252a(4) =1512a(5) =12096a(6) =60480a(7) =393120a(8) =3538080a(9) =42456960a(10) =396264960a(11) =5547709440a(12) =66572513280a(13) =798870159360
External references
- oeis: A066987