Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, down, down.
A177538
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4941a(8) =38736a(9) =341496a(10) =3354939a(11) =36244098a(12) =427006404a(13) =5448087216a(14) =74864913552
External references
- oeis: A177538