Fibonacci bisection minus powers of 2.

Terms

a(0) =-1a(1) =-1a(2) =-1a(3) =0a(4) =5a(5) =23a(6) =80a(7) =249a(8) =731a(9) =2072a(10) =5741a(11) =15663a(12) =42272a(13) =113201a(14) =301427a(15) =799272a(16) =2112773a(17) =5571815a(18) =14668208a(19) =38563881a(20) =101285579a(21) =265817144a(22) =697214429a(23) =1827923295a(24) =4790749760a(25) =12552714593a(26) =32884171235a(27) =86133353544a(28) =225582998261a(29) =590749858967