Convolution of A048272 and A022567.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =9a(5) =15a(6) =27a(7) =42a(8) =65a(9) =99a(10) =148a(11) =214a(12) =308a(13) =435a(14) =605a(15) =839a(16) =1145a(17) =1548a(18) =2080a(19) =2769a(20) =3659a(21) =4812a(22) =6278a(23) =8145a(24) =10518a(25) =13506a(26) =17257a(27) =21961a(28) =27821a(29) =35095