a532.py « progs - clp - A small Python compiler with optimizer written in Java

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def get_pell(n): 
	if (n <= 2): 
		return n 
	a = 1
	b = 2
	for i in range(3, n+1): 
		c = 2 * b + a 
		a = b 
		b = c 
	return b