Number of ways to place 6 nonattacking knights on a 6 X n board.

Terms

a(0) =1a(1) =58a(2) =729a(3) =8830a(4) =60285a(5) =257318a(6) =858262a(7) =2404448a(8) =5879329a(9) =12927182a(10) =26115008a(11) =49238436a(12) =87675623a(13) =148787822a(14) =242366502a(15) =381127124a(16) =581249573a(17) =862965246a(18) =1251190796a(19) =1776208532a(20) =2474393475a(21) =3388987070a(22) =4570917554a(23) =6079666980