Number of ways to place 5 nonattacking bishops on an n X n board.

Terms

a(0) =0a(1) =0a(2) =0a(3) =112a(4) =3368a(5) =39680a(6) =282248a(7) =1444928a(8) =5865552a(9) =20014112a(10) =59673360a(11) =159698416a(12) =391202680a(13) =890095584a(14) =1902427800a(15) =3853570560a(16) =7450556064a(17) =13829016768a(18) =24759442464a(19) =42930138864a(20) =72328779720a(21) =118747638592