Erroneous version of A309982.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =31a(6) =61a(7) =115a(8) =213a(9) =388a(10) =691a(11) =1218a(12) =2110a(13) =3617a(14) =6113a(15) =10238a(16) =16945a(17) =27802a(18) =45180a(19) =72838a(20) =116479a(21) =184936a(22) =291556a(23) =456694a(24) =710907a(25) =1100192a(26) =1693123a(27) =2591830a(28) =3947417a(29) =5982953