Pentatope number

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Notion

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Science and technology

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What Wikipedia says

In number theory, a pentatope number (or hypertetrahedral number or triangulo-triangular number) is a number in the fifth cell of any row of Pascal's triangle starting with the 5-term row 1 4 6 4 1, either from left to right or from right to left.

Excerpt from the Wikipedia article “Pentatope number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Cmglee, CC BY-SA 4.0, via Wikimedia Commons.