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A170881 as a simple table

na(n)
00
11
23
38
421
553
6129
7305
8705
91601
103585
117937
1217409
1337889
1481921
15176129
16376833
17802817
181703937
193604481
207602177
2115990785
2233554433
2370254593
24146800641
25306184193
26637534209
271325400065
282751463425
295704253441
3011811160065
3124427626497
3250465865729

[0,1,3,8,21,53,129,305,705,1601,3585,7937,17409,
 37889,81921,176129,376833,802817,1703937,3604481,
 7602177,15990785,33554433,70254593,146800641,
 306184193,637534209,1325400065,2751463425,
 5704253441,11811160065,24427626497,50465865729]