A hexagonal
The numbers have the form:
References
* [http://mathworld.wolfram.com/HexagonalPyramidalNumber.html Hexagonal pyramidal number at MathWorld]
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Pyramidal number — A pyramidal number is a figurate number that represents a pyramid with a base and a given number of sides. The term is most often used to refer to square pyramidal numbers, which have four sides, but it can also refer to:*Triangular pyramidal… … Wikipedia
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Centered hexagonal number — A centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice. The n th centered hexagonal number is given by the… … Wikipedia
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