a(n) = 2^(n^2 + 2n + 1)*Product_{j=1..n} (4^j - 1).
A090770
a(n) = 2^(n^2 + 2n + 1)*Product_{j=1..n} (4^j - 1).
Terms
- a(0) =2a(1) =48a(2) =23040a(3) =185794560
External references
- oeis: A090770
A090770
a(n) = 2^(n^2 + 2n + 1)*Product_{j=1..n} (4^j - 1).