Number of permutations with no hits on 2 main diagonals.
A003471
Number of permutations with no hits on 2 main diagonals.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =16a(6) =80a(7) =672a(8) =4752a(9) =48768a(10) =440192a(11) =5377280a(12) =59245120a(13) =839996160a(14) =10930514688a(15) =176547098112
External references
- oeis: A003471