a(n) = 11^n + n.

Terms

a(0) =1a(1) =12a(2) =123a(3) =1334a(4) =14645a(5) =161056a(6) =1771567a(7) =19487178a(8) =214358889a(9) =2357947700a(10) =25937424611a(11) =285311670622