Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, down.

A177526

Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, down.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =680a(7) =4480a(8) =33600a(9) =285434a(10) =2684680a(11) =27812170a(12) =313926560a(13) =3842611240a(14) =50625902600a(15) =714873188122

External references