Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, down.
A177531
Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =710a(7) =4900a(8) =38640a(9) =342720a(10) =3376800a(11) =36603975a(12) =432850200a(13) =5545086300a(14) =76500496800
External references
- oeis: A177531