Partial sums of A024785.

Terms

a(0) =2a(1) =5a(2) =10a(3) =17a(4) =30a(5) =47a(6) =70a(7) =107a(8) =150a(9) =197a(10) =250a(11) =317a(12) =390a(13) =473a(14) =570a(15) =683a(16) =820a(17) =987a(18) =1160a(19) =1357a(20) =1580a(21) =1863a(22) =2176a(23) =2493a(24) =2830a(25) =3177a(26) =3530a(27) =3897a(28) =4270a(29) =4653