Today I learned that there are trinomial coefficients and they have a triangle too. http://mathworld.wolfram.com/TrinomialCoefficient.html …
Replying to @futurebird
For what it's worth, the q-multinomial coefficients have a relationship with Sierpinski triangles https://arxiv.org/pdf/1708.07429
4:10 PM - 24 Mar 2018
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