Number of ways to place 2 non-attacking wazirs on an n X n toroidal board.

Terms

a(0) =0a(1) =2a(2) =18a(3) =88a(4) =250a(5) =558a(6) =1078a(7) =1888a(8) =3078a(9) =4750a(10) =7018a(11) =10008a(12) =13858a(13) =18718a(14) =24750a(15) =32128a(16) =41038a(17) =51678a(18) =64258a(19) =79000a(20) =96138a(21) =115918a(22) =138598a(23) =164448a(24) =193750a(25) =226798a(26) =263898a(27) =305368a(28) =351538a(29) =402750