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A054018 as a simple table

na(n)
19
21
316
49
525
616
725
849
916
101
1164
12121
1336
1481
1564
16169
1764
1836
19100
20225
2164
2236
23121
2436
25169
2649
27361
28225
291
30144
31441
32441
33144
34256
35400
36196
3764
38441
391
40144
41361
4264
43400
44441
45729
4664
47196
48144
49729
50100
51841
52729
5325
54400
55256
561225
57100
58729
591225

[9,1,16,9,25,16,25,49,16,1,64,121,36,81,64,169,64,
 36,100,225,64,36,121,36,169,49,361,225,1,144,441,
 441,144,256,400,196,64,441,1,144,361,64,400,441,
 729,64,196,144,729,100,841,729,25,400,256,1225,
 100,729,1225]