Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, up, up.
A177544
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, down, up, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4885a(8) =37840a(9) =329400a(10) =3182400a(11) =33778800a(12) =391590750a(13) =4915323791a(14) =66442003448a(15) =962278914330
External references
- oeis: A177544