a(n) = 2^(n*(n-1))*(2^n + 1)*Product_{i=1..n-1} (4^i - 1).
A144545
a(n) = 2^(n*(n-1))*(2^n + 1)*Product_{i=1..n-1} (4^i - 1).
Terms
- a(0) =2a(1) =3a(2) =60a(3) =25920a(4) =197406720
External references
- oeis: A144545
A144545
a(n) = 2^(n*(n-1))*(2^n + 1)*Product_{i=1..n-1} (4^i - 1).