Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, down, down.
A177542
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4976a(8) =39296a(9) =349056a(10) =3444480a(11) =37382400a(12) =442506240a(13) =5674931536a(14) =78376004800
External references
- oeis: A177542