a(n) = (-1)^(n(n-1)/2) * Product_{k=0,...,n-1} (n+k-1)!/((k!)^2 * (n-1-k)!).
A060739
a(n) = (-1)^(n(n-1)/2) * Product_{k=0,...,n-1} (n+k-1)!/((k!)^2 * (n-1-k)!).
Terms
- a(0) =1a(1) =1a(2) =-2a(3) =-36a(4) =7200a(5) =17640000a(6) =-560105280000
External references
- oeis: A060739