Eight rooks and one berserker on a 3 X 3 chessboard. G.f.: (1 - 2*x^2)/(1 - 4*x + x^2 + 2*x^3).
A180144
Eight rooks and one berserker on a 3 X 3 chessboard. G.f.: (1 - 2*x^2)/(1 - 4*x + x^2 + 2*x^3).
Terms
- a(0) =1a(1) =4a(2) =13a(3) =46a(4) =163a(5) =580a(6) =2065a(7) =7354a(8) =26191a(9) =93280a(10) =332221a(11) =1183222a(12) =4214107a(13) =15008764a(14) =53454505a(15) =190381042a(16) =678052135a(17) =2414918488a(18) =8600859733a(19) =30632416174a(20) =109098967987a(21) =388561736308
External references
- oeis: A180144