4000752

Appears in sequences

• Triangle read by rows: T(n,k) = binomial(n,k)^2 * binomial(2*(n-k), n-k).at n=49A318397
• Areas of nondegenerate triangles with perimeter A385737(n) whose side lengths are triangular numbers.at n=29A385872
• Expansion of e.g.f. (1/x) * Series_Reversion( x * (1 - x^2*(exp(x)-1)^2) ).at n=9A392767