Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026659.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =10a(6) =17a(7) =27a(8) =45a(9) =73a(10) =132a(11) =218a(12) =379a(13) =598a(14) =1027a(15) =1653a(16) =2962a(17) =4821a(18) =8453a(19) =13323a(20) =23187a(21) =37071a(22) =66416a(23) =107042a(24) =188815a(25) =297120a(26) =521383a(27) =829285a(28) =1487461a(29) =2380551