Number of 6-cycles in the n X n queen graph.

Terms

a(0) =0a(1) =0a(2) =976a(3) =26414a(4) =207136a(5) =951750a(6) =3190304a(7) =8721576a(8) =20615340a(9) =43736788a(10) =85332868a(11) =155691014a(12) =268995384a(13) =444000894a(14) =705336724a(15) =1083967932a(16) =1619250600a(17) =2358809948a(18) =3361809572a(19) =4697700286a(20) =6451359236a(21) =8719953330a(22) =11620829368