454730

Appears in sequences

• Triangle T(n,k) read by rows: T(n,k) = Sum_{j=0..k} (-1)^j *binomial(n+1,j)*(k+2-j)^n, 0 <= k < n.at n=50A180246
• Number of Catalan words of length n avoiding the pattern 000.at n=18A307464