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

Terms

a(0) =0a(1) =8a(2) =52a(3) =184a(4) =480a(5) =1040a(6) =1988a(7) =3472a(8) =5664a(9) =8760a(10) =12980a(11) =18568a(12) =25792a(13) =34944a(14) =46340a(15) =60320a(16) =77248a(17) =97512a(18) =121524a(19) =149720a(20) =182560a(21) =220528a(22) =264132a(23) =313904a(24) =370400a(25) =434200a(26) =505908a(27) =586152a(28) =675584a(29) =774880