n = int(input()); mod = 998244353 dp = [[0]*(2*n+1-i) for i in range(2*n+1)]; dp[1][1] = 1 for i in range(1,2*n+1): for j in range(1,2*n+1-i): if i>2: dp[i][j] += (i-2)*(i-1)//2*dp[i-2][j] if j>2: dp[i][j] += (j-2)*(j-1)//2*dp[i][j-2] if i>1