Partial sums of A001190.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =14a(7) =25a(8) =48a(9) =94a(10) =192a(11) =399a(12) =850a(13) =1833a(14) =4012a(15) =8862a(16) =19767a(17) =44398a(18) =100409a(19) =228321a(20) =521868a(21) =1198025a(22) =2761397a(23) =6387546a(24) =14823925a(25) =34504202a(26) =80530820a(27) =188421429a(28) =441872140a(29) =1038444527