Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, down, down.
A177548
Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5025a(8) =40080a(9) =359640a(10) =3585600a(11) =39322800a(12) =470448000a(13) =6097392939a(14) =85106238492
External references
- oeis: A177548