Number of rotationally symmetric solutions for queens on n X n board.

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =2a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =8a(12) =8a(13) =0a(14) =0a(15) =64a(16) =128a(17) =0a(18) =0a(19) =480a(20) =704a(21) =0a(22) =0a(23) =3328a(24) =3264a(25) =0a(26) =0a(27) =32896a(28) =43776a(29) =0