Eight white kings and one red king on a 3 X 3 chessboard. G.f.: 1/(1-3*x-5*x^2+4*x^3).
A179610
Eight white kings and one red king on a 3 X 3 chessboard. G.f.: 1/(1-3*x-5*x^2+4*x^3).
Terms
- a(0) =1a(1) =3a(2) =14a(3) =53a(4) =217a(5) =860a(6) =3453a(7) =13791a(8) =55198a(9) =220737a(10) =883037a(11) =3532004a(12) =14128249a(13) =56512619a(14) =226051086a(15) =904203357a(16) =3616815025a(17) =14467257516a(18) =57869034245a(19) =231476130215a(20) =925904531806
External references
- oeis: A179610