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Hexagonal Pyramidal Number

A Pyramidal Number of the form $n(n+1)(4n-1)/6$, The first few are 1, 7, 22, 50, 95, ... (Sloane's A002412). The Generating Function of the hexagonal pyramidal numbers is



Sloane, N. J. A. Sequence A002412/M4374 in ``An On-Line Version of the Encyclopedia of Integer Sequences.'' and Sloane, N. J. A. and Plouffe, S. The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.

© 1996-9 Eric W. Weisstein