已知数列an的通项公式是an=(n 2)(6⼀7)^n,判断 数列an有没有最大项，若有，求出最大项

是an=(n^2)(6/7)^n这样的吧

EXCEL 算的最大值在n=13时

1 0.857142857
2 2.93877551
3 5.667638484
4 8.636401499
5 11.56660915
6 14.27650044
7 16.65591718
8 18.64685771
9 20.22851082
10 21.40583156
11 22.2009053
12 22.64649608
13 22.78129666
14 22.64649608
15 22.28335985
16 21.73158141
17 21.0282155
18 20.20704445
19 19.29826203
20 18.32838499
21 17.32032382
22 16.29356021
23 15.264392
24 14.24621625
25 13.2498291
26 12.28372727
27 11.35440048
28 10.46660785
29 9.623633971
30 8.827522243
31 8.079284643
32 7.379087981
33 6.726417532
34 6.120219336
35 5.559022753
36 5.041045006
37 4.564279506
38 4.126569722
39 3.725670289
40 3.359296964
41 3.025166891
42 2.721030541
43 2.444696535
44 2.194050449
45 1.967068547
46 1.761827321
47 1.57650954
48 1.409407481
49 1.25892387
50 1.123571015