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A098475 as a simple table

na(n)
03
15
27
325
461
5145
6361
7853
81969
94489
1010069
1122273
1248781
13105949
14228589
15490405
161046977
172225965
184715401
199956977
2020965213
2144031361
2292262349
23192920785
24402629257
25838827577
261744784389
273623814865
287516104565

[3,5,7,25,61,145,361,853,1969,4489,10069,22273,
 48781,105949,228589,490405,1046977,2225965,
 4715401,9956977,20965213,44031361,92262349,
 192920785,402629257,838827577,1744784389,
 3623814865,7516104565]