Given u0 = 1, u1 = 2
and the relation 6unun+1-5unun+2+un+1un+2 = 0
calculate un for any integer n >= 0
.
Example:
fcn(n) returns un: fcn(17) -> 131072, fcn(21) -> 2097152
Note:
You can look at this as
-Purely algorithmic from the definition of u^n
-the second one - not at all mandatory, but as a compliment - is to get a bit your head around and find which sequence is hidden behind u^n
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Top comments (2)
for others not understanding the task, check out the link to the original: codewars.com/kata/563f0c54a22b9345...
I didn't understand the recurrence relation. Is 6unun == 6*un*un?