Introduction - If you have any usage issues, please Google them yourself
When the print is usually used in Yang Hui Yang Hui triangle triangle of the two properties. The first is in addition to the outermost layer of Yang Hui triangle (not including the Yang Hui triangle bottom) number is 1, the remaining number is it on the shoulders of two numbers. Yang Hui triangle with the array output to use this character. The second is the nature of the first n rows of Yang Hui triangle is exactly C (n, 0) ~ C (n, n). Where C that combination. Yang Hui triangle array output not to use this character.