a(1) = 1, a(n) = 12*a(n-1) + n.

Terms

a(0) =1a(1) =14a(2) =171a(3) =2056a(4) =24677a(5) =296130a(6) =3553567a(7) =42642812a(8) =511713753a(9) =6140565046a(10) =73686780563a(11) =884241366768