a(n) = (3/2)*a(n-1) if a(n-1) is even; (3/2)*(a(n-1)+1) if a(n-1) is odd.

Terms

a(0) =1a(1) =3a(2) =6a(3) =9a(4) =15a(5) =24a(6) =36a(7) =54a(8) =81a(9) =123a(10) =186a(11) =279a(12) =420a(13) =630a(14) =945a(15) =1419a(16) =2130a(17) =3195a(18) =4794a(19) =7191a(20) =10788a(21) =16182a(22) =24273a(23) =36411a(24) =54618a(25) =81927a(26) =122892a(27) =184338a(28) =276507a(29) =414762