a(n) = Sum_{k=0..n} k! * n^k.A368561a(n) = Sum_{k=0..n} k! * n^k.Terms a(0) =1a(1) =2a(2) =11a(3) =184a(4) =6565a(5) =390806a(6) =34557919a(7) =4237440628a(8) =687219772553External referencesoeis: A368561