Number of ways to place n nonattacking empresses on an n X n board.
A137774
Number of ways to place n nonattacking empresses on an n X n board.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =8a(4) =20a(5) =94a(6) =438a(7) =2766a(8) =19480a(9) =163058a(10) =1546726a(11) =16598282a(12) =197708058a(13) =2586423174a(14) =36769177348a(15) =563504645310
External references
- oeis: A137774