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A272060 as a simple table

na(n)
13
25
317
4257
5325
61025
765537
882945
9202501
10250001
112829125
127496645
1310240001
1413675205
1516000001
1627060805
1748469445
1871402501
19133448705
20150062501
21156250001
22172186885
23182250001
24343064485
25354117125
26453519617
27467943425
281235663105

[3,5,17,257,325,1025,65537,82945,202501,250001,
 2829125,7496645,10240001,13675205,16000001,
 27060805,48469445,71402501,133448705,150062501,
 156250001,172186885,182250001,343064485,354117125,
 453519617,467943425,1235663105]