Convolution of A023532 and A000201.

Terms

a(0) =1a(1) =3a(2) =5a(3) =10a(4) =15a(5) =20a(6) =29a(7) =37a(8) =47a(9) =58a(10) =70a(11) =85a(12) =100a(13) =116a(14) =134a(15) =153a(16) =173a(17) =195a(18) =219a(19) =244a(20) =268a(21) =296a(22) =324a(23) =354a(24) =387a(25) =419a(26) =454a(27) =489a(28) =526a(29) =564