Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, down.
A177528
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, down.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =685a(7) =4550a(8) =34440a(9) =292320a(10) =2746800a(11) =28402925a(12) =320224500a(13) =3909695400a(14) =51396618000a(15) =723952593000
External references
- oeis: A177528