Convolution of A023531 and A014306.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =0a(5) =2a(6) =2a(7) =1a(8) =2a(9) =3a(10) =2a(11) =2a(12) =3a(13) =2a(14) =4a(15) =4a(16) =3a(17) =3a(18) =4a(19) =4a(20) =4a(21) =5a(22) =3a(23) =4a(24) =5a(25) =5a(26) =5a(27) =5a(28) =5a(29) =5