Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, up, down.
A177543
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, up, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4768a(8) =35968a(9) =312064a(10) =3004160a(11) =31764480a(12) =365798400a(13) =4555499520a(14) =61232590848a(15) =882227765248
External references
- oeis: A177543