Loterre: Mathematics: dodecahedral number

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dodecahedral number

A dodecahedral number is a figurate number that represents a dodecahedron. The nth dodecahedral number is given by the formula
${\\displaystyle {n(3n-1)(3n-2) \\over 2}={3n \\choose 3}}$
The first such numbers are 0, 1, 20, 84, 220, 455, 816, 1330, 2024, 2925, 4060, 5456, 7140, 9139, 11480, … (sequence A006566 in the OEIS).
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Dodecahedral_number)

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