Convolution of A023531 and A023533.

Terms

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