Hi to all 
! I agree with @5DN1L : that’s not an error :
→ your task is not to add twice a value in the square, nor in the diagonals 
…
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fun and codingames !
Typos, it’s 8n - 15, 12n - 35 and 13n - 42 (the rest of the computation is good so I guess you had it right on your side but wrong when writing your comment)
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Your solution has complexity O(n) not O(1).
…my final solution has been “censored” for not spoiler to others, so you didn’t see it…
it is O(1) since it uses a fixed number of operations, regardless of n value
I found the solution, it is cool when you can generalize problem and find an equation.