a(n) = 9*A006190(n)+1.

Terms

a(0) =1a(1) =10a(2) =28a(3) =91a(4) =298a(5) =982a(6) =3241a(7) =10702a(8) =35344a(9) =116731a(10) =385534a(11) =1273330a(12) =4205521a(13) =13889890a(14) =45875188a(15) =151515451a(16) =500421538a(17) =1652780062a(18) =5458761721a(19) =18029065222a(20) =59545957384a(21) =196666937371a(22) =649546769494