해결책
n = int(input()) d = [0] * (n+1) if n % 2 != 0: print(0) else: d[0] = 1 for i in range(2, n+1, 2): d[i] = d[i-2] * 3 for j in range(0, i-2, 2): d[i] += d[j] * 2 print(d[n])