a(n) = floor(11^n/7^n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =15a(7) =23a(8) =37a(9) =58a(10) =91a(11) =144a(12) =226a(13) =356a(14) =559a(15) =879a(16) =1382a(17) =2172a(18) =3414a(19) =5365a(20) =8431a(21) =13249a(22) =20820a(23) =32717a(24) =51412a(25) =80791a(26) =126958a(27) =199505a(28) =313509a(29) =492657