Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, up, down.
A177536
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, up, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4962a(8) =39072a(9) =346032a(10) =3404160a(11) =36853442a(12) =435133488a(13) =5566069380a(14) =76676528112
External references
- oeis: A177536