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.
Construct a string from letters and counts
Return 'on' or 'off'
Given a 4x4 matrix, swap the two middle columns
Mysterious digits operation (easy)
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
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