a(n) = floor(tau*a(n-1)) + a(n-2) with a(0)=0 and a(1)=2.

Terms

a(0) =0a(1) =2a(2) =3a(3) =6a(4) =12a(5) =25a(6) =52a(7) =109a(8) =228a(9) =477a(10) =999a(11) =2093a(12) =4385a(13) =9188a(14) =19251a(15) =40336a(16) =84516a(17) =177085a(18) =371045a(19) =777448a(20) =1628982a(21) =3413196a(22) =7151649a(23) =14984807a(24) =31397576a(25) =65787152a(26) =137843423a(27) =288822495a(28) =605168036