• 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.

./20170318-2200-cet-factorial-mathematics-notation-but-with-addition-1.png

  • Explanation about nth triangle number.
  • Here is the full screenshot.

./20170318-2200-cet-factorial-mathematics-notation-but-with-addition-2.png