Number of weak up-down sequences of length n and values in {1,2,...,n}.
A276313
Number of weak up-down sequences of length n and values in {1,2,...,n}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =14a(4) =85a(5) =671a(6) =6405a(7) =72302a(8) =940005a(9) =13846117a(10) =227837533a(11) =4142793511a(12) =82488063476
External references
- oeis: A276313