squared triangular number

the sum of the first n cubes, which equals the square of the nth triangular number

en-US/ˈskwɛɹd tɹaɪˈæŋɡjəlɚ ˈnʌmbɚ/
en-GB/ˈskwɛəd tɹaɪˈænɡjʊlə ˈnʌmbə/

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integer sequencetheoremequality