a(n) = 10*n + 2.

Terms

a(0) =2a(1) =12a(2) =22a(3) =32a(4) =42a(5) =52a(6) =62a(7) =72a(8) =82a(9) =92a(10) =102a(11) =112a(12) =122a(13) =132a(14) =142a(15) =152a(16) =162a(17) =172a(18) =182a(19) =192a(20) =202a(21) =212a(22) =222a(23) =232a(24) =242a(25) =252a(26) =262a(27) =272a(28) =282a(29) =292