Please fill in a number in the brackets of the following sequence to make it meet the law and explain it! 88、87、（）、335、3220 I don't know the answer Please help me It's reasonable!

Please fill in a number in the brackets of the following sequence to make it meet the law and explain it! 88、87、（）、335、3220 I don't know the answer Please help me It's reasonable!

Let a = BN ^ 3 + CN ^ 2 + DN + E,
Then A1 = B + C + D + e = 88, (1)
a2=8b+4c+2d+e=87,(2)
a4=64b+16c+4d+e=335,(3)
a5=125b+25c+5d+e=3220.(4)
(2)-(1),7b+3c+d=-1,(5)
(3)-(2),56b+12c+2d=248,
28b+6c+d=124.(6)
(4)-(3),61b+9c+d=2885.(7)
(6)-(5),21b+3c=125,(8)
(7)-(6),33b+3c=2761.(9)
From (8) and (9), B = 659 / 3, C = - 1485
Substituting (5), d = 8749 / 3,
Substituting (1) e = - 1563,
∴a=(659/3)n^3-1485n^2+(8749/3)n-1563,
A3 = - 248