Number of possible queen moves on an n X n chessboard.

Terms

a(0) =0a(1) =12a(2) =56a(3) =152a(4) =320a(5) =580a(6) =952a(7) =1456a(8) =2112a(9) =2940a(10) =3960a(11) =5192a(12) =6656a(13) =8372a(14) =10360a(15) =12640a(16) =15232a(17) =18156a(18) =21432a(19) =25080a(20) =29120a(21) =33572a(22) =38456a(23) =43792a(24) =49600a(25) =55900a(26) =62712a(27) =70056a(28) =77952a(29) =86420