Trisection of A007294.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =15a(6) =22a(7) =32a(8) =44a(9) =60a(10) =81a(11) =107a(12) =141a(13) =181a(14) =233a(15) =295a(16) =372a(17) =465a(18) =575a(19) =710a(20) =869a(21) =1059a(22) =1286a(23) =1549a(24) =1863a(25) =2225a(26) =2654a(27) =3149a(28) =3724a(29) =4391