Numerator of Sum_{k=0..n} n^k/k!.

Terms

a(0) =2a(1) =5a(2) =13a(3) =103a(4) =1097a(5) =1223a(6) =47273a(7) =556403a(8) =10661993a(9) =7281587a(10) =62929017101a(11) =7218065a(13) =595953719897