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A226917 as a simple table

na(n)
21
34
49
525
658
7142
8324
9748
101672
113736
128208
1317968
1438944
1584064
16180288
17385216
18819328

[1,4,9,25,58,142,324,748,1672,3736,8208,17968,
 38944,84064,180288,385216,819328]