Pascal

Pascal’s triangle is made up by adding the two numbers directly above e.g. the highlighted squares 3+1=4

Fibonacci Sequence
Try this: make a pattern by going up and then along, then add up the squares you will get the Fibonacci Sequence. 

(The Fibonacci Sequence starts "1, 1" and then continues by adding the two previous numbers, for example 3+5=8, then 5+8=13, etc)

Symmetrical
And the triangle is also symmetrical. The numbers on the left side have identical matching numbers on the right side, like a mirror image.





discovered by Eddy