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

A180141

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

Terms

    a(0) =1a(1) =4a(2) =16a(3) =72a(4) =312a(5) =1368a(6) =5976a(7) =26136a(8) =114264a(9) =499608a(10) =2184408a(11) =9550872a(12) =41759064a(13) =182582424a(14) =798301656a(15) =3490399512a(16) =15261008472a(17) =66725422488a(18) =291742318296

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