Convolution of natural numbers with composite numbers.

Terms

a(0) =4a(1) =14a(2) =32a(3) =59a(4) =96a(5) =145a(6) =208a(7) =286a(8) =380a(9) =492a(10) =624a(11) =777a(12) =952a(13) =1151a(14) =1375a(15) =1625a(16) =1902a(17) =2207a(18) =2542a(19) =2909a(20) =3309a(21) =3743a(22) =4212a(23) =4717a(24) =5260a(25) =5842a(26) =6464a(27) =7128a(28) =7836a(29) =8589