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A175257 as a simple table

na(n)
13
25
313
437
573
6109
7181
8541
91621
104861
119721
1219441
1358321
1487481
15379081
16408241
172041201
182449441
197348321
2014696641
2122044961
2295528161
23382112641
242292675841
258024365441
2640121827201
27481461926401
28722192889601
292888771558401
307944121785601
3155608852499201
32111217704998401
33889741639987201
341779483279974401

[3,5,13,37,73,109,181,541,1621,4861,9721,19441,
 58321,87481,379081,408241,2041201,2449441,7348321,
 14696641,22044961,95528161,382112641,2292675841,
 8024365441,40121827201,481461926401,722192889601,
 2888771558401,7944121785601,55608852499201,
 111217704998401,889741639987201,1779483279974401]