a(n) = 2^(n-1)*u(n) where u(1)=1 and u(n) = frac(3/2*u(n-1)) + 1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =29a(5) =55a(6) =101a(7) =175a(8) =269a(9) =807a(10) =1397a(11) =2143a(12) =6429a(13) =11095a(14) =16901a(15) =50703a(16) =86573a(17) =259719a(18) =517013a(19) =1026751a(20) =2031677a(21) =3997879a(22) =7799333a(23) =15009391a(24) =28250957a(25) =51198439a(26) =86486453a(27) =259459359a(28) =509942621a(29) =992956951