Definition:Pentagonal Pyramidal Number/Sequence
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Sequence of Pentagonal Pyramidal Numbers
The sequence of pentagonal pyramidal numbers begins as follows:
- $0, 1, 6, 18, 40, 75, 126, 196, 288, 405, 550, 726, 936, 1183, \ldots$
This sequence is A002411 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).