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A273116 as a simple table

na(n)
01
15
217
341
4189
5977
64013
714577
860617
9241005
10964021
113841653
1215349713
1361414133
14245738437
15982690957

[1,5,17,41,189,977,4013,14577,60617,241005,964021,
 3841653,15349713,61414133,245738437,982690957]