Sum of factorials of the digits of n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5040a(8) =40320a(9) =362880a(10) =2a(11) =2a(12) =3a(13) =7a(14) =25a(15) =121a(16) =721a(17) =5041a(18) =40321a(19) =362881a(20) =3a(21) =3a(22) =4a(23) =8a(24) =26a(25) =122a(26) =722a(27) =5042a(28) =40322a(29) =362882