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

A180147

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

Terms

    a(0) =1a(1) =7a(2) =31a(3) =139a(4) =607a(5) =2659a(6) =11623a(7) =50827a(8) =222223a(9) =971635a(10) =4248247a(11) =18574555a(12) =81213151a(13) =355086787a(14) =1552539271a(15) =6788138539a(16) =29679651247a(17) =129767784979a(18) =567381262423

External references