Definition:Generalised Pentagonal Number

Definition
The Generalised Pentagonal Numbers are given by:


 * $\dfrac {n \left({3 n - 1}\right)} 2$

for $n = 0, 1, -1, 2, -2, \ldots$

The first terms of this sequence are:

$0, 1, 2, 5, 7, 12, 15, 22, 26, 35 \ldots$

Also see

 * Definition:Pentagonal Number