a(n) = n^(n-1) + 1.

Terms

a(0) =2a(1) =3a(2) =10a(3) =65a(4) =626a(5) =7777a(6) =117650a(7) =2097153a(8) =43046722a(9) =1000000001a(10) =25937424602a(11) =743008370689