Can someone shed a light on how to solve something like this? I've been looking for permutations but so far I found it very confusing. As I'm not at home atm, I can't reach for my math books either for an answer. Maybe you can help?
- a 5x5 grid
- each cell can have 2 possible values: 0 or 1
- each resulting grid "layout" must be bilateral-symmetric ( on the vertical axis )
Question: What's the number of possible variations?
Thanks a lot!