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A262918 as a simple table

na(n)
15
29
353
4137
5853
62953
717333
871721
9394325
101791209
119435253
1244924617
13230950613
141126125513
155713545653
1628200027881
17142082597845
18705663892009
193542422689653
2017650591452297
2188436516562773
22441384307595273

[5,9,53,137,853,2953,17333,71721,394325,1791209,
 9435253,44924617,230950613,1126125513,5713545653,
 28200027881,142082597845,705663892009,
 3542422689653,17650591452297,88436516562773,
 441384307595273]