Write a function to find the nth jacobsthal-lucas number.
def jacobsthal_lucas(n): 
	dp=[0] * (n + 1) 
	dp[0] = 2
	dp[1] = 1
	for i in range(2, n+1): 
		dp[i] = dp[i - 1] + 2 * dp[i - 2]; 
	return dp[n]
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to find the nth jacobsthal-lucas number.
def jacobsthal_lucas(n): 
	dp=[0] * (n + 1) 
	dp[0] = 2
	dp[1] = 1
	for i in range(2, n+1): 
		dp[i] = dp[i - 1] + 2 * dp[i - 2]; 
	return dp[n][/INST]assert jacobsthal_lucas(5) == 31
assert jacobsthal_lucas(2) == 5
assert jacobsthal_lucas(4) == 17</s>