a(n) = (1/(n-1)!) * Product_{i=1..n-1} (2^n-2^i).
A377642
a(n) = (1/(n-1)!) * Product_{i=1..n-1} (2^n-2^i).
Terms
- a(0) =1a(1) =2a(2) =12a(3) =224a(4) =13440a(5) =2666496a(6) =1791885312
External references
- oeis: A377642
A377642
a(n) = (1/(n-1)!) * Product_{i=1..n-1} (2^n-2^i).