a(n) = s(1)*s(n) + s(2)*s(n-1) + ... + s(k)*s(n+1-k), where k = floor((n+1)/2), s = A023531.

Terms

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