a(n) = floor((3/sqrt(5))^n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =5a(7) =7a(8) =10a(9) =14a(10) =18a(11) =25a(12) =34a(13) =45a(14) =61a(15) =82a(16) =110a(17) =147a(18) =198a(19) =266a(20) =357a(21) =479a(22) =642a(23) =862a(24) =1156a(25) =1552a(26) =2082a(27) =2793a(28) =3748a(29) =5028