a(n) = (smallest digit of n)^(largest digit of n) + n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =30a(4) =260a(5) =3130a(6) =46662a(7) =823550a(8) =16777224a(9) =387420498a(10) =10a(11) =12a(12) =13a(13) =14a(14) =15a(15) =16a(16) =17a(17) =18a(18) =19a(19) =20a(20) =20a(21) =22a(22) =26a(23) =31a(24) =40a(25) =57a(26) =90a(27) =155a(28) =284a(29) =541