Number of ways to place a non-attacking white and black knight on n X n chessboard.

Terms

a(0) =0a(1) =12a(2) =56a(3) =192a(4) =504a(5) =1100a(6) =2112a(7) =3696a(8) =6032a(9) =9324a(10) =13800a(11) =19712a(12) =27336a(13) =36972a(14) =48944a(15) =63600a(16) =81312a(17) =102476a(18) =127512a(19) =156864a(20) =191000a(21) =230412a(22) =275616a(23) =327152a(24) =385584a(25) =451500a(26) =525512a(27) =608256a(28) =700392a(29) =802604