Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, up, down, up.
A177546
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, up, down, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4871a(8) =37616a(9) =326376a(10) =3161321a(11) =33647702a(12) =391315387a(13) =4925158550a(14) =66783060318a(15) =969759198692
External references
- oeis: A177546