疑难找规律

85815

（这道题不适合发到逻辑区因为我觉得这不是人做的题）
朋友给的题，据说是某一届IMO的神奇找规律。
0,1,3,2,5,4,6,3,7,6,8,5,10,7,9,4，？
网上没答案（至少我没找到）
@天马行空

22568

@我作甚..
下一项是9527,因为通项公式是

1. 173611-(138484294591/240240)*n+(93077/20922789888000)*n^16-(405811/242611200)*n^13+(43745389/1046139494400)*n^14-(332897/523069747200)*n^15-(131188972409/914457600)*n^9+(95142558001/7315660800)*n^10-(73271267/82114560)*n^11+(5233364797/114960384000)*n^12+(165599910762199/201801600)*n^2-(223117770655471/330220800)*n^3+(17638785137200319/48432384000)*n^4-(14102969295311/102643200)*n^5+(217097008707211/5748019200)*n^6-(4052785211849/522547200)*n^7+(176656363444427/146313216000)*n^8

复制代码

嘛..言归正传..
A326730
oeis都有的东西乃告诉我网上搜不到?

0, 0, 3, 1, 5, 7, 4, 3, 9, 11, 8, 15, 14, 9, 10, 7, 17, 19, 16, 23, 22, 17, 18, 31, 26, 29, 30, 19, 24, 21, 22, 15, 33, 35, 32, 39, 38, 33, 34, 47, 42, 45, 46, 35, 40, 37, 38, 63, 50, 53, 54, 59, 48, 61, 62, 39, 60, 49, 50, 43, 52, 45, 46, 31, 65, 67, 64, 71, 70, 65, 66, 79, 74, 77, 78, 67, 72, 69, 70, 95, 82, 85, 86, 91, 80, 93, 94, 71, 92, 81, 82, 75, 84, 77, 78, 127, 98, 101, 102, 107, 96

Problem 5 of IMO 2019