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A051633 as a simple table

na(n)
03
18
218
338
478
5158
6318
7638
81278
92558
105118
1110238
1220478
1340958
1481918
15163838
16327678
17655358
181310718
192621438
205242878
2110485758
2220971518
2341943038
2483886078
25167772158
26335544318
27671088638
281342177278
292684354558
305368709118
3110737418238
3221474836478

[3,8,18,38,78,158,318,638,1278,2558,5118,10238,
 20478,40958,81918,163838,327678,655358,1310718,
 2621438,5242878,10485758,20971518,41943038,
 83886078,167772158,335544318,671088638,1342177278,
 2684354558,5368709118,10737418238,21474836478]