Number of permutations of [n] having exactly one adjacent 4-cycle.
A369098
Number of permutations of [n] having exactly one adjacent 4-cycle.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =2a(6) =6a(7) =24a(8) =118a(9) =714a(10) =5016a(11) =40200a(12) =362163a(13) =3623772a(14) =39876540a(15) =478639080a(16) =6223394516a(17) =87138394540
External references
- oeis: A369098