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A197818 as a simple table

na(n)
01
13
25
315
417
551
693
7255
8257
9771
101453
113855
124593
1313299
1423901
1565535
1665537
17196611
18371373
19983055
201175281
213394803
226103645
2316711935
2416908033
2550593539
2695245741
27252706575
28301011441
29871576563
301566432605
314294967295

[1,3,5,15,17,51,93,255,257,771,1453,3855,4593,
 13299,23901,65535,65537,196611,371373,983055,
 1175281,3394803,6103645,16711935,16908033,
 50593539,95245741,252706575,301011441,871576563,
 1566432605,4294967295]