Convolution of A023531 and A000201.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =7a(5) =11a(6) =13a(7) =17a(8) =21a(9) =26a(10) =31a(11) =35a(12) =41a(13) =47a(14) =53a(15) =59a(16) =66a(17) =73a(18) =79a(19) =86a(20) =95a(21) =102a(22) =111a(23) =119a(24) =126a(25) =136a(26) =144a(27) =154a(28) =163a(29) =173