With this seed, you can quickly get to an interesting plain with a village and mansion. Coordinates are 650 ~ 150. Another good settlement is located at the coordinates -300 ~ 600. It is quite large and also located on the plain, which allows you to freely build any building.
How to use Plain with Village and Mansion seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter mansionspawn