a(n) = floor(tau*a(n-2)) + a(n-1) with a(0)=1 and a(1)=3.

Terms

a(0) =1a(1) =3a(2) =4a(3) =8a(4) =14a(5) =26a(6) =48a(7) =90a(8) =167a(9) =312a(10) =582a(11) =1086a(12) =2027a(13) =3784a(14) =7063a(15) =13185a(16) =24613a(17) =45946a(18) =85770a(19) =160112a(20) =298890a(21) =557956a(22) =1041570a(23) =1944361a(24) =3629656a(25) =6775698a(26) =12648604a(27) =23611913a(28) =44077784a(29) =82282661