Partial sums of A030279.

Terms

a(0) =1a(1) =9a(2) =59a(3) =335a(4) =1732a(5) =8404a(6) =38969a(7) =174637a(8) =762063a(9) =3255119a(10) =13662512a(11) =56511312a(12) =230859729a(13) =933104857a(14) =3736739227a(15) =14843364031a(16) =58540883044a(17) =229411923796a(18) =893904838857