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A141249 as a simple table

na(n)
11
221
333
445
573
681
7193
8201
9241
10273
11313
12381
13421
14445
15453
16661
17693
18861
19885
20913

[1,21,33,45,73,81,193,201,241,273,313,381,421,445,
 453,661,693,861,885,913]