Eight rooks and one berserker on a 3 X 3 chessboard. G.f.: (1 - 3*x^2)/(1 - 4*x - 3*x^2 + 6*x^3).

A180145

Eight rooks and one berserker on a 3 X 3 chessboard. G.f.: (1 - 3*x^2)/(1 - 4*x - 3*x^2 + 6*x^3).

Terms

    a(0) =1a(1) =4a(2) =16a(3) =70a(4) =304a(5) =1330a(6) =5812a(7) =25414a(8) =111112a(9) =485818a(10) =2124124a(11) =9287278a(12) =40606576a(13) =177543394a(14) =776269636a(15) =3394069270a(16) =14839825624a(17) =64883892490a(18) =283690631212

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