Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, down, up.
A177539
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, down, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4859a(8) =37424a(9) =323784a(10) =3107520a(11) =32749200a(12) =376929246a(13) =4698101279a(14) =63058148792a(15) =906829731450
External references
- oeis: A177539