4个1和3个2的排法(不能两个2在一起)

三餐1陈彦颖问的一个问题

其作法同以下链接类似:

https://chtanmaths.wordpress.com/2011/05/07/triangle%e6%b2%a1%e6%9c%89%e4%b8%a4%e4%b8%aa%e6%af%8d%e9%9f%b3%e5%9c%a8%e4%b8%80%e8%b5%b7%e7%9a%84%e5%85%a8%e9%83%a8%e6%8e%92%e6%b3%95/

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