321690

Appears in sequences

• "Half-Catalan numbers": a(n) = Sum_{k=1..floor(n/2)} a(k)*a(n-k) with a(1) = 1.at n=19A000992
• Coefficients of a special case of Poisson-Charlier polynomials.at n=52A046716
• Triangle read by rows: T(n,k) are the coefficients of Charlier polynomials: A046716 transposed, for 0 <= k <= n.at n=47A094816
• Expansion of e.g.f. log(1-x)^2 * exp(x) / 2.at n=9A381021