Number of cycles of length 3 in the queen graph associated with an n X n chessboard.

Terms

a(0) =0a(1) =0a(2) =4a(3) =36a(4) =124a(5) =320a(6) =672a(7) =1260a(8) =2152a(9) =3456a(10) =5260a(11) =7700a(12) =10884a(13) =14976a(14) =20104a(15) =26460a(16) =34192a(17) =43520a(18) =54612a(19) =67716a(20) =83020a(21) =100800a(22) =121264a(23) =144716a(24) =171384a(25) =201600a(26) =235612a(27) =273780a(28) =316372a(29) =363776