Number of permutations of [n] with at least one hit on both main diagonals.
A378907
Number of permutations of [n] with at least one hit on both main diagonals.
Terms
- a(0) =0a(1) =1a(2) =0a(3) =2a(4) =10a(5) =48a(6) =270a(7) =2004a(8) =15406a(9) =144656a(10) =1399070a(11) =15924940a(12) =185817038a(13) =2485431096a(14) =33966603790a(15) =522088434644
External references
- oeis: A378907