Convolution of A008619 and A001400.

Terms

a(0) =1a(1) =2a(2) =5a(3) =9a(4) =17a(5) =27a(6) =44a(7) =65a(8) =97a(9) =136a(10) =191a(11) =257a(12) =346a(13) =451a(14) =587a(15) =746a(16) =946a(17) =1177a(18) =1461a(19) =1786a(20) =2178a(21) =2623a(22) =3151a(23) =3746a(24) =4443a(25) =5223a(26) =6126a(27) =7131a(28) =8283a(29) =9558