Number of ways to place 2n rooks on n X n board, 2 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 4 rooks below the main diagonal.
A260582
Number of ways to place 2n rooks on n X n board, 2 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 4 rooks below the main diagonal.
Terms
- a(0) =1a(1) =72a(2) =2438a(3) =48965a(4) =727982a(5) =9002669a(6) =98831244a(7) =1001534339a(8) =9604385112a(9) =88600727292a(10) =795108048465
External references
- oeis: A260582