a(1) = 0
a(2) = 1
a(2*N) = sqrt(a(2*N-1)*a(2*N+1))
a(2*N+1) = (a(2*N)+a(2*N+2))/2
given n return a(n)
The two recursion equations are mixed up.
Connect Four Win Checker
Least common multiple of many numbers
intersection of matrices
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Replace multiples of 5 with NaN
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