Trisection of A007294.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =11a(5) =17a(6) =24a(7) =35a(8) =48a(9) =66a(10) =89a(11) =117a(12) =153a(13) =197a(14) =252a(15) =320a(16) =401a(17) =501a(18) =619a(19) =763a(20) =933a(21) =1134a(22) =1374a(23) =1654a(24) =1985a(25) =2372a(26) =2821a(27) =3345a(28) =3949a(29) =4652