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dp 문제로 점화식을 구해서 풀 수 있습니다.
n번째 정삼각형의 변의 길이는 n-2번째 삼각형과 n-3번째 삼각형의 변의 길이의 합과 같다.
따라서 f(n) = f(n-2) + f(n-2) (단 n=1,2,3 일 때 f(n) = 1) 이다.