@Binbin, in this problem, I reallize that we can see pretty much every possible way that can describing this particular seq. lol
apparently, each one of us have our own way pray to lord for giving us this glory shining sequence. lol
Make a checkerboard matrix
Return the 3n+1 sequence for n
Given a window, how many subsets of a vector sum positive
Permute diagonal and antidiagonal
Create a vector whose elements depend on the previous element
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