Number of ways to place 5 nonattacking amazons (superqueens) on an n X n toroidal board.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =640a(8) =7290a(9) =123640a(10) =640574a(11) =3869280a(12) =12950132a(13) =47022360a(14) =123467040a(15) =340840960a(16) =759697190a(17) =1758672648a(18) =3494388306a(19) =7150739360a(20) =13041285516a(21) =24354594440a(22) =41566378136a(23) =72345297024a(24) =117101090250a(25) =192694385416a(26) =298703838186a(27) =469581881888a(28) =702148696580