Number of left-right-balanced permutations of {1, 2, ..., n}.
A250035
Number of left-right-balanced permutations of {1, 2, ..., n}.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =8a(4) =24a(5) =0a(6) =216a(7) =4608a(8) =20736a(9) =0a(10) =1267200a(11) =30067200a(12) =194918400a(13) =0a(14) =27840153600a(15) =855119462400a(17) =0a(21) =0a(25) =0
External references
- oeis: A250035