[meuk]

You should approximate it with an exponential function. Actually, the nth Fibonacci can be obtained exactly by rounding an exponential function:

https://en.wikipedia.org/wiki/Fibonacci_number#Computation_b...

[kazinator]

I'm well aware of the closed form for Fibonacci since my undergrad days. This was produced as a kind of joke. I simply took the first several, plus 42 thrown in, and fit them to an N-th degree polynomial.