Numerator of Sum_{k=0..n} 1/k!.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =65a(5) =163a(6) =1957a(7) =685a(8) =109601a(9) =98641a(10) =9864101a(11) =13563139a(12) =260412269a(13) =8463398743a(14) =47395032961a(15) =888656868019