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

Terms

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