51044

Appears in sequences

• Number of 4-level rooted trees with n leaves.at n=12A007713
• Number of distinct regular languages over 3-ary alphabet, whose minimum regular expression has ordinary length n.at n=7A211951
• G.f.: Sum_{n>=0} (x^n - 1)^n * x^n / (1-x)^(n+1).at n=43A243919
• Number of ways that n can be expressed as a sum of consecutive integers from 0 up to at most n, where any of the terms in the sum can be negated, and the partial sum from 0 is always between 0 and n inclusive.at n=62A364721