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. ^_^
Remove NaN ?
letter yes yes & letter no no
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Sum My Indices
Simple sum 1
Modulo of sum of square of first n primes with 24
Sum of infinite series.
Modulo with 5
sum of binomial series
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