https://ace.c9.io/
Website:http://www.odysseyweb.idv.tw/
Discord:https://discord.gg/ht4mwMG
YouTube:https://www.youtube.com/channel/UCQwGJo1JXmIR-SMY8tXL5Uw
https://github.com/ajaxorg/ace
https://github.com/ajaxorg/ace/releases
數字階乘