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Truncated Octahedral Number


A figurate number which is constructed as an octahedral number with a square pyramid removed from each of the six graph vertices,

TO_n=O_(3n-2)-6P_(n-1)^((4))
(1)
=16n^3-33n^2+24n-6,
(2)

where O_n is an octahedral number and P_n^((4)) is a square pyramidal number. The first few are 1, 38, 201, 586, ... (OEIS A005910). The generating function for the truncated octahedral numbers is

 (x(6x^3+55x^2+34x+1))/((x-1)^4)=x+38x^2+201x^3+....
(3)

See also

Octahedral Number, Square Pyramidal Number

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References

Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, p. 52, 1996.Sloane, N. J. A. Sequence A005910/M5266 in "The On-Line Encyclopedia of Integer Sequences."

Referenced on Wolfram|Alpha

Truncated Octahedral Number

Cite this as:

Weisstein, Eric W. "Truncated Octahedral Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/TruncatedOctahedralNumber.html

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