The Leibniz harmonic triangle is the number triangle given by 1/1 1/2 1/2 1/3 1/6 1/3 1/4 1/12 1/12 1/4 1/5 1/20 1/30 1/20 1/5 (OEIS A003506), where each fraction is the sum of numbers below it and the initial and final entries in the nth row are given by 1/n.

Catalan's triangle | Clark's triangle | Euler's number triangle | Losanitsch's triangle | number triangle | Pascal's triangle | Seidel-Entringer-Arnold triangle