Convolution of A023532 and A023533.

Terms

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