a(n) = 4^(n-2) * (n+1)^(n-4) * (3*n^2 + 13*n + 16).
A251584
a(n) = 4^(n-2) * (n+1)^(n-4) * (3*n^2 + 13*n + 16).
Terms
- a(0) =1a(1) =1a(2) =6a(3) =82a(4) =1856a(5) =59904a(6) =2533888a(7) =133169152a(8) =8384643072a(9) =616038400000
External references
- oeis: A251584