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The trinomial triangle is a triangular array of numbers similar to Pascal's triangle. The top row consists of a single 1, and each subsequent row contains 2 more numbers than the last. Each number is the sum of the 3 numbers above it, i.e.
1 2 3 6
Print the first 20 rows of the trinomial triangle.
Variants: Pascal’s Triangle
External links: OEIS A027907, Wikipedia
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