a(n) = 3^(n-1) * (n+1)^(n-3) * (n+3).
A251583
a(n) = 3^(n-1) * (n+1)^(n-3) * (n+3).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =54a(4) =945a(5) =23328a(6) =750141a(7) =29859840a(8) =1420541793a(9) =78732000000
External references
- oeis: A251583
A251583
a(n) = 3^(n-1) * (n+1)^(n-3) * (n+3).