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. ^_^
Sums with Excluded Digits
Matrix indexing with two vectors of indices
Implement simple rotation cypher
03 - Matrix Variables 6
Tony's trick for duplicating an mx1 vector n times
Sum of infinite series.
Modulo with 5
Modulo of sum of square of first n primes with 24
Simple sum 1
sum of binomial series
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