a(n) = floor(6^n/5^n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =3a(8) =4a(9) =5a(10) =6a(11) =7a(12) =8a(13) =10a(14) =12a(15) =15a(16) =18a(17) =22a(18) =26a(19) =31a(20) =38a(21) =46a(22) =55a(23) =66a(24) =79a(25) =95a(26) =114a(27) =137a(28) =164a(29) =197