Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, up, up.
A177549
Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, up, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =720a(7) =4969a(8) =39184a(9) =347544a(10) =3424320a(11) =37150741a(12) =439774085a(13) =5639099103a(14) =77873192126
External references
- oeis: A177549