Partial sums of A019565.

Terms

a(0) =1a(1) =3a(2) =6a(3) =12a(4) =17a(5) =27a(6) =42a(7) =72a(8) =79a(9) =93a(10) =114a(11) =156a(12) =191a(13) =261a(14) =366a(15) =576a(16) =587a(17) =609a(18) =642a(19) =708a(20) =763a(21) =873a(22) =1038a(23) =1368a(24) =1445a(25) =1599a(26) =1830a(27) =2292a(28) =2677a(29) =3447