Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, up, down, down.
A177545
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, up, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4929a(8) =38544a(9) =338904a(10) =3309120a(11) =35521200a(12) =415704960a(13) =5271197205a(14) =71977504692
External references
- oeis: A177545