Partial sums of A001037, omitting A001037(1).

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =13a(5) =22a(6) =40a(7) =70a(8) =126a(9) =225a(10) =411a(11) =746a(12) =1376a(13) =2537a(14) =4719a(15) =8799a(16) =16509a(17) =31041a(18) =58635a(19) =111012a(20) =210870a(21) =401427a(22) =766149a(23) =1465019a(24) =2807195a(25) =5387990a(26) =10358998a(27) =19945393a(28) =38458183a(29) =74248450