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A115618 as a simple table

na(n)
04
18
217
337
481
5177
6385
7833
81793
93841
108193
1117409
1236865
1377825
14163841
15344065
16720897
171507329
183145729
196553601
2013631489
2128311553
2258720257
23121634817
24251658241
25520093697
261073741825
272214592513
284563402753
299395240961
3019327352833
3139728447489

[4,8,17,37,81,177,385,833,1793,3841,8193,17409,
 36865,77825,163841,344065,720897,1507329,3145729,
 6553601,13631489,28311553,58720257,121634817,
 251658241,520093697,1073741825,2214592513,
 4563402753,9395240961,19327352833,39728447489]