A132803 Number of simple permutations in S_n, i.e., those whose "cycle graph" (or "breakpoint graph") only contains alternating cycles of length at most 3.
1, 2, 6, 16, 48, 204, 876, 3636, 18756, 105480, 561672
Offset: 1
Links
- J.-P. Doignon and A. Labarre, On Hultman Numbers, J. Integer Seq., 10 (2007), 13 pages.