Problem 197. Recurrence relation
A recurrence relation is given by
P(1) := 1 P(n+1) := exp(1) - (n+1)*P(n)
Write a function that, given an integer n, returns P(n). The n will be smaller than 100 in all test-suite problems and an absolute precision of 10*eps (~2e-15, i.e. almost machine precision) is required.
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