Convolution of natural numbers with A023531.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =9a(7) =11a(8) =14a(9) =17a(10) =20a(11) =23a(12) =26a(13) =30a(14) =34a(15) =38a(16) =42a(17) =46a(18) =50a(19) =55a(20) =60a(21) =65a(22) =70a(23) =75a(24) =80a(25) =85a(26) =91a(27) =97a(28) =103a(29) =109