Woodrow Wilson's favourite number was 13. I don't know why, but I read it in a book by a Swedish historian. His points for the Versailles Treaty were supposed to been have 13 too, but he had to make them 14.
Why did he have to make them 14? Were people being superstitious about the number 13? 
No, he couldn't get eveything he wanted contained in just 13 points.
In short the 14 points were:
1. There should be an end to all secret diplomacy amongst countries.
2. Freedom of the seas in peace and war
3. The reduction of trade barriers among nations
4. The general reduction of armaments
5. The adjustment of colonial claims in the interest of the inhabitants as well as of the colonial powers
6. The evacuation of Russian territory and a welcome for its government to the society of nations
7. The restoration of Belgium
8. The evacuation of all French territory, including Alsace-Lorraine
9. The readjustment of Italian boundaries along clearly recognizable lines of nationality
10. Independence for various national groups in Austria-Hungary
11. The restoration of the Balkan nations and free access to the sea for Serbia
12. Protection for minorities in Turkey and the free passage of the ships of all nations through the Dardanelles
13. Independence for Poland, including access to the sea
14. A league of nations to protect "mutual guarantees of political independence and territorial integrity to great and small nations alike."
Though everything ended in a farce anyway.
