数字-1、0、31、80、63、（）、5的规律

填496155270441
y = (-1) * (x-2)(x-3)(x-4)(x-5)(x-6)(x-7) / (1-2)(1-3)(1-4)(1-5)(1-6)(1-7)
+ 0 * (x-1)(x-3)(x-4)(x-5)(x-6)(x-7) / (2-1)(2-3)(2-4)(2-5)(2-6)(2-7)
+ 31 * (x-1)(x-2)(x-4)(x-5)(x-6)(x-7) / (3-1)(3-2)(3-4)(3-5)(3-6)(3-7)
+ 80 * (x-1)(x-2)(x-3)(x-5)(x-6)(x-7) / (4-1)(4-2)(4-3)(4-5)(4-6)(4-7)
+ 63 * (x-1)(x-2)(x-3)(x-4)(x-6)(x-7) / (5-1)(5-2)(5-3)(5-4)(5-6)(5-7)
+ 496155270441 * (x-1)(x-2)(x-3)(x-4)(x-5)(x-7) / (6-1)(6-2)(6-3)(6-4)(6-5)(6-7)
+ 5 * (x-1)(x-2)(x-3)(x-4)(x-5)(x-6) / (7-1)(7-2)(7-3)(7-4)(7-5)(7-6)