Add TrinomialTriangle algorithm

[Flonator3000]

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Add TrinomialTriangle algorithm

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Additional context
The trinomial triangle is a variation of Pascal’s triangle. The difference between the two is that an entry in the trinomial triangle is the sum of the three (rather than the two in Pasacal’s triangle) entries above it.

[Flonator3000]

PR already created.

[github-actions]

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