a(n) = A027641(n) * A164555(n).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =0a(8) =1a(9) =0a(10) =25a(11) =0a(12) =477481a(13) =0a(14) =49a(15) =0a(16) =13082689a(17) =0a(18) =1924313689a(19) =0a(20) =30489001321a(21) =0a(22) =730192467169a(23) =0a(25) =0a(27) =0a(29) =0a(31) =0a(33) =0