Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, up, up.
A177537
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, up, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4985a(8) =39440a(9) =351000a(10) =3470400a(11) =37738800a(12) =447766925a(13) =5755249449a(14) =79663786022
External references
- oeis: A177537