Sum of all n-digit Bell numbers.

Terms

a(0) =9a(1) =67a(2) =1080a(3) =4140a(4) =21147a(5) =794545a(6) =4213597a(7) =27644437a(8) =190899322a(9) =1382958545a(10) =93345011951a(11) =682076806159