a(n) equals the constant term in the sum of all permutations of compositions of functions (1 + k*x) for k=1..n.
A277405
a(n) equals the constant term in the sum of all permutations of compositions of functions (1 + k*x) for k=1..n.
Terms
- a(0) =1a(1) =5a(2) =40a(3) =524a(4) =10776a(5) =327732a(6) =13920096a(7) =788050944a(8) =57348311040
External references
- oeis: A277405