Originally Posted by
Steel Maiden
It's just addition really.
. . . 1
. . .1 1
. . 1 2 1
. 1 3 3 1
1 4 6 4 1
You add the two numbers together (i.e. 3 + 3) and then you write the answer in the line below, between the two numbers (i.e. 6).
I did it in base 3, base 4 and even hexadecimal. That was fun :)