Centered tetrahedral number

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A centered tetrahedral number is a centered figurate number that represents a tetrahedron. The centered tetrahedral number for a specific n is given by

The first such numbers are 1, 5, 15, 35, 69, 121, 195, 295, 425, 589, 791, … (sequence A005894 in the OEIS).

References

  • Deza, E.; Deza, M. (2012). Figurate Numbers. Singapore: World Scientific Publishing. pp. 126–128. ISBN 978-981-4355-48-3.
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