Nearest integer to (n/e)^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =5a(4) =21a(5) =116a(6) =751a(7) =5628a(8) =47811a(9) =453999a(10) =4765190a(11) =54782415a(12) =684597510a(13) =9239952802a(14) =133952757201