pentatope number

/P EH1 N T AH0 T OW1 P N AH0 M B ER0/
noun
  1. 1

    (mathematics) 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, and representing the number of 3-dimensional unit spheres that can be packed into a pentatope.

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