a(n) = n-1, if n <= 2, otherwise A107458(n-1) + A107458(n-2).

Terms

a(0) =-1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =1a(7) =1a(8) =2a(9) =3a(10) =4a(11) =6a(12) =9a(13) =13a(14) =19a(15) =28a(16) =41a(17) =60a(18) =88a(19) =129a(20) =189a(21) =277a(22) =406a(23) =595a(24) =872a(25) =1278a(26) =1873a(27) =2745a(28) =4023a(29) =5896