- I asked a stupid question, asking about is there any specific notation for factorial but with addition.
- I forgot either at which part this formula make sense to this project.
- Here is the discussion link, http://math.stackexchange.com/questions/593318/factorial-but-with-addition/593320.
- At simplest I can still use sigma notation.
- At any case there is this formula to calculate the sum of the numbers in the patters,
(n(n + 1))/2
.
- This is a theory about nth triangle number.
- Explanation about nth triangle number.
- Here is the full screenshot.