A number triangle is a sequence of numbers written in stacked rows with subsequent rows of increasing length.
Number Triangle
See also
Bell Triangle, Bernoulli Triangle, Catalan's Triangle, Clark's Triangle, Euler's Number Triangle, Leibniz Harmonic Triangle, Losanitsch's Triangle, Magog Triangle, Monotone Triangle, Pascal's Triangle, Seidel-Entringer-Arnold Triangle, Sierpiński Sieve, Trinomial TriangleExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Number Triangle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NumberTriangle.html