Talk:Octahedral number

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This article is to be expanded by giving a formula.

(moved from the article to this discussion page - Tεxτurε 19:49, 8 Apr 2004 (UTC))

Alternative formula[edit]

Try this: (4n3+2n)/6


Moderator of

The OEIS gives the formula (2n^3 + n)/3, which is obviously the same as the same as the one you give but expressed in the lowest common denominator. PrimeFan (talk) 00:29, 20 December 2007 (UTC)