Number of ways to place 5 non-attacking ferses on an n X n board.

Terms

a(0) =0a(1) =0a(2) =12a(3) =780a(4) =16286a(5) =159452a(6) =992412a(7) =4567836a(8) =16959488a(9) =53617596a(10) =149618794a(11) =377841356a(12) =879314442a(13) =1911495356a(14) =3922051616a(15) =7657895196a(16) =14321764860a(17) =25791609308a(18) =44921419134a(19) =75946019596a(20) =125016699158a(21) =200899440924a(22) =315872975684a(23) =486869916572a(24) =736910896536