Eight white queens and one red queen on a 3 X 3 chessboard. G.f.: (1+x)/(1-5*x-7*x^2).

A180032

Eight white queens and one red queen on a 3 X 3 chessboard. G.f.: (1+x)/(1-5*x-7*x^2).

Terms

    a(0) =1a(1) =6a(2) =37a(3) =227a(4) =1394a(5) =8559a(6) =52553a(7) =322678a(8) =1981261a(9) =12165051a(10) =74694082a(11) =458625767a(12) =2815987409a(13) =17290317414a(14) =106163498933a(15) =651849716563

External references