Partial sums of A001652.

Terms

a(0) =0a(1) =3a(2) =23a(3) =142a(4) =838a(5) =4897a(6) =28557a(7) =166460a(8) =970220a(9) =5654879a(10) =32959075a(11) =192099594a(12) =1119638514a(13) =6525731517a(14) =38034750617a(15) =221682772216