a(n) = n*(n+1)*(n+2)*a(n-1)/6 for n >= 1; a(0) = 1.
A087047
a(n) = n*(n+1)*(n+2)*a(n-1)/6 for n >= 1; a(0) = 1.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =40a(4) =800a(5) =28000a(6) =1568000a(7) =131712000a(8) =15805440000
External references
- oeis: A087047
A087047
a(n) = n*(n+1)*(n+2)*a(n-1)/6 for n >= 1; a(0) = 1.