Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, up, up, up.
A177551
Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, up, up, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =5006a(8) =39776a(9) =355536a(10) =3530880a(11) =38581456a(12) =459905790a(13) =5938902464a(14) =82590382604
External references
- oeis: A177551