题解(Python)

def count_sequences(n):
dp = [0] * (n + 1)
dp[1] = 1
for i in range(2, n + 1):
dp[i] = 1
for j in range(1, i // 2 + 1):
dp[i] += dp[j]
return dp[n]
n = int(input().strip())
print(count_sequences(n))