Triangle read by rows: T(n,k) = number of arrangements of k non-attacking rooks on an n X n right triangular board with every square controlled by at least one rook.
A290724
Triangle read by rows: T(n,k) = number of arrangements of k non-attacking rooks on an n X n right triangular board with every square controlled by at least one rook.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =4a(5) =1a(6) =0a(7) =2a(8) =11a(9) =1a(10) =0a(11) =0a(12) =18a(13) =26a(14) =1a(15) =0a(16) =0a(17) =6a(18) =100a(19) =57a(20) =1a(21) =0a(22) =0a(23) =0a(24) =96a(25) =444a(26) =120a(27) =1a(28) =0a(29) =0
External references
- oeis: A290724