a(n) is the number of inequivalent permutations of {0..2n-1}, such that the first differences (modulo 2n) are a permutation of {1..2n-1}.
A067601
a(n) is the number of inequivalent permutations of {0..2n-1}, such that the first differences (modulo 2n) are a permutation of {1..2n-1}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =144a(5) =1928a(6) =44664a(7) =1377984a(8) =51826560
External references
- oeis: A067601