304080

Appears in sequences

• Number of 3-line Latin rectangles.at n=4A000536
• Triangle of coefficients of q in e.g.f. that satisfies: A(x,q) = exp( q*x*A(q*x,q) ), read by rows of [n*(n-1)/2 + 1] terms in row n for n>=0.at n=73A126265