Number of unsigned permutations of size n whose "cycle graph" (or "breakpoint graph") is composed of alternating cycles of length at most 3.
A132803
Number of unsigned permutations of size n whose "cycle graph" (or "breakpoint graph") is composed of alternating cycles of length at most 3.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =16a(4) =48a(5) =204a(6) =876a(7) =3636a(8) =18756a(9) =105480a(10) =561672a(11) =3356640a(12) =22353696a(13) =143893296a(14) =977085072a(15) =7337123280a(16) =54681854544a(17) =416178085536
External references
- oeis: A132803