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A194455 as a simple table

na(n)
02
16
211
318
429
548
683
7150
8281
9540
101055
112082
124133
138232
1416427
1532814
1665585
17131124
18262199
19524346
201048637
212097216
224194371
238388678
2416777289
2533554508
2667108943
27134217810
28268435541
29536871000
301073741915
312147483742
324294967393
338589934692
3417179869287

[2,6,11,18,29,48,83,150,281,540,1055,2082,4133,
 8232,16427,32814,65585,131124,262199,524346,
 1048637,2097216,4194371,8388678,16777289,33554508,
 67108943,134217810,268435541,536871000,1073741915,
 2147483742,4294967393,8589934692,17179869287]