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A115881 as a simple table

na(n)
10
20
31
40
54
62
79
81
916
108
1125
124
1336
1418
1549
169
1764
1832
1981
2016
21100
2250
23121
2425
25144
2672
27169
2836
29196
3098
31225
3249
33256
34128
35289
3664
37324
38162
39361
4081
41400
42200
43441
44100
45484
46242
47529
48121
49576
50288
51625
52144
53676
54338
55729
56169
57784
58392
59841
60196

[0,0,1,0,4,2,9,1,16,8,25,4,36,18,49,9,64,32,81,16,
 100,50,121,25,144,72,169,36,196,98,225,49,256,128,
 289,64,324,162,361,81,400,200,441,100,484,242,529,
 121,576,288,625,144,676,338,729,169,784,392,841,
 196]