Triangle read by rows: rook numbers of certain "probleme des rencontres" boards of the second kind of size n X k (0 <= k <= n).
A220905
Triangle read by rows: rook numbers of certain "probleme des rencontres" boards of the second kind of size n X k (0 <= k <= n).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =1a(7) =6a(8) =6a(9) =2a(10) =1a(11) =24a(12) =132a(13) =176a(14) =24a(15) =1a(16) =60a(17) =960a(18) =4580a(19) =5040a(20) =552a(21) =1a(22) =120a(23) =4260a(24) =52960a(25) =213000a(26) =206592a(27) =21280a(28) =1a(29) =210
External references
- oeis: A220905