a(n) = n!*Sum_{k=1..n} (k-1)^k/k!.

Terms

a(0) =0a(1) =0a(2) =1a(3) =11a(4) =125a(5) =1649a(6) =25519a(7) =458569a(8) =9433353a(9) =219117905a(10) =5677963451a(11) =162457597961