Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, up, up.
A177541
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, up, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4990a(8) =39520a(9) =352080a(10) =3484800a(11) =37936800a(12) =450606300a(13) =5797965980a(14) =80341280840
External references
- oeis: A177541