题解 | #尼科彻斯定理#

while True:
    try:
        n = int(input())
        if n == 1:
            print(1)
        gap = n * n - n + 1
        res = ''
        for i in range(n):
            if i < n-1:
                temp = str(gap + i * 2) + '+'
            else:
                temp = str(gap + i * 2)
            res += temp
        print(res)
    except:
        break