20018880

Appears in sequences

• Triangle T(n, k) = n!*StirlingS2(n, k)/binomial(n, k), read by rows.at n=50A156815
• Triangle read by rows: T(n,k) is the number of achiral colorings of the edges of a regular n-dimensional simplex using exactly k colors. Row n has (n+1)*n/2 columns.at n=27A327090
• E.g.f. A(x) satisfies A(x) = (1+x) * exp(x^3 * (1+x)^2 * A(x)).at n=9A389822