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

A179606

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

Terms

    a(0) =1a(1) =4a(2) =17a(3) =71a(4) =298a(5) =1249a(6) =5237a(7) =21956a(8) =92053a(9) =385939a(10) =1618082a(11) =6783941a(12) =28442233a(13) =119246404a(14) =499950377a(15) =2096083151a(16) =8788001338a(17) =36844419769a(18) =154473265997a(19) =647641896836

External references