a(1) = 0, and for n > 1, a(n) = 2*a(A252463(n)) + [n == 1 (mod 2)]*[J(3|n) == -1], where J is the Jacobi-symbol.

A292255

a(1) = 0, and for n > 1, a(n) = 2*a(A252463(n)) + [n == 1 (mod 2)]*[J(3|n) == -1], where J is the Jacobi-symbol.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =3a(7) =0a(8) =0a(9) =2a(10) =6a(11) =0a(12) =12a(13) =6a(14) =0a(15) =0a(16) =25a(17) =0a(18) =51a(19) =4a(20) =4a(21) =12a(22) =102a(23) =0a(24) =0a(25) =24a(26) =0a(27) =12a(28) =205a(29) =0

External references