Number of permutations of [n] avoiding adjacent step pattern {up}^9.
A230232
Number of permutations of [n] avoiding adjacent step pattern {up}^9.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5040a(8) =40320a(9) =362880a(10) =3628799a(11) =39916779a(12) =479001228a(13) =6227014404a(14) =87178179816
External references
- oeis: A230232