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A131478 as a simple table

na(n)
00
11
24
321
464
5157
6324
7601
81024
91641
102500
113661
125184
137141
149604
1512657
1616384
1720881
1826244
1932581
2040000
2148621
2258564
2369961
2482944
2597657
26114244
27132861
28153664
29176821
30202500
31230881
32262144
33296481
34334084
35375157
36419904
37468541
38521284

[0,1,4,21,64,157,324,601,1024,1641,2500,3661,5184,
 7141,9604,12657,16384,20881,26244,32581,40000,
 48621,58564,69961,82944,97657,114244,132861,
 153664,176821,202500,230881,262144,296481,334084,
 375157,419904,468541,521284]