Centered polyhedral number

The centered polyhedral numbers are a class of figurate numbers, each formed by a central dot, surrounded by polyhedral layers with a constant number of edges. The length of the edges increases by one in each additional layer.

Examples

gollark: Also, you can contribute code to it. Just send me random bits of code you like and I'll put them in somewhere.
gollark: The string metatable bug uses our highly advanced superglobal technology.
gollark: Also, it has the string metatable bug and can dump to tapes and also cannot be removed without solving a small mathematical problem.
gollark: Oh, and try the `b` command and whatever command views the privacy policy and licenses.
gollark: Well, yes, but it detects *specific* unsafe programs.

References

  • Deza, Elena; Deza, Michel (2012). Figurate Numbers. Singapore: World Scientific Publishing. p. 120. ISBN 978-981-4355-48-3.
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