Ten as a Triangular Number

In the post below I talked about the significance of the number ten. Here is another facet for those of you who enjoy these studies as much as I do.
Triangular numbers are those that can be represented by an equilatersl triangle.
These won't publish the way I print them, but you get the idea if you think bowling pins.

For instance, the number 3 is the first triangular number:
0
0 0

The number 10 is the first triangular number that has a center:
0
0 0
0 0 0
0 0 0 0
0 0 0 0 0
It is the only triangular number in which the center is half the total number - pretty amazing.

The year 2010 holds great promise. Expect Amazing Things!