Number of permutations of [n] having no adjacent 3-cycles, i.e., no cycles of the form (i, i+1, i+2).
A177251
Number of permutations of [n] having no adjacent 3-cycles, i.e., no cycles of the form (i, i+1, i+2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =22a(5) =114a(6) =697a(7) =4923a(8) =39612a(9) =357899a(10) =3588836a(11) =39556420a(12) =475392841a(13) =6187284605a(14) =86701097310
External references
- oeis: A177251