Number of undirected circular permutations i_1,...,i_{n-1} of 1,...,n-1 with i_1-i_2, ..., i_{n-2}-i_{n-1}, i_{n-1}-i_1 pairwise distinct modulo n.
A228762
Number of undirected circular permutations i_1,...,i_{n-1} of 1,...,n-1 with i_1-i_2, ..., i_{n-2}-i_{n-1}, i_{n-1}-i_1 pairwise distinct modulo n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =7a(5) =0a(6) =39a(7) =0a(8) =419a(9) =0a(10) =7208a(11) =0a(12) =226512a(13) =0a(14) =7885970a(15) =0a(16) =345718580a(17) =0a(18) =18478915794a(19) =0
External references
- oeis: A228762