Correct idea. But take care of the overflow. This sequence just explodes at high values of n. Try enhancing the modular arithmetic in it.
I didn't expected the recursion to work because of it's exponential time complexity O(3^(n-3)). But it worked :O.
Nicely written code. ^_^
System of equations
Find perfect placement of non-rotating dominoes (easier)
Create One Large Eye of size N x N Quickly?
Find a subset that divides the vector into equal halves
Area of an equilateral triangle
Modulo of sum of square of first n primes with 24
sum of binomial series
Sum of infinite series.
Modulo with 5
Simple sum 1
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