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A dodecahedral number is a figurate number that represents a dodecahedron. The nth dodecahedral number is given by the formula

$ {n(3n-1)(3n-2) \over 2} $

The first such numbers are 0, 1, 20, 84, 220, 455, 816, 1330, 2024, 2925, 4060, 5456, 7140, 9139, 11480, … OEIS A{{{1}}}.

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