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. ^_^
Find and replaces spaces from a input string with *
Sum the 'edge' values of a matrix
Natural numbers in string form
Modulo of sum of square of first n primes with 24
Simple sum 1
Modulo with 5
Sum of infinite series.
sum of binomial series
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