a(n) = 11^n + 1.

Terms

a(0) =2a(1) =12a(2) =122a(3) =1332a(4) =14642a(5) =161052a(6) =1771562a(7) =19487172a(8) =214358882a(9) =2357947692a(10) =25937424602a(11) =285311670612