Enumeration of partial sums of 1 + [1,2] + [2,3] + [1,2] + [2,3] + ...

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =4a(6) =4a(7) =6a(8) =11a(9) =15a(10) =18a(11) =27a(12) =43a(13) =59a(14) =78a(15) =115a(16) =172a(17) =239a(18) =330a(19) =480a(20) =698a(21) =980a(22) =1379a(23) =1988a(24) =2856a(25) =4037a(26) =5726a(27) =8211a(28) =11737a(29) =16656