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. ^_^
Is the Point in a Circle?
Combined Ages 1 - Symmetric, n = 3
Matrix of almost all zeros, except for main diagonal
0, 2, 0, -2, 0, 2, 0, -2, ...
Simple sum 1
Modulo with 5
Sum of infinite series.
sum of binomial series
Modulo of sum of square of first n primes with 24
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