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A181366 as a simple table

na(n)
10
21
32
45
510
620
738
874
9144
10282
11552
121086
132144
144247
158430
1616761
1733364
1866479
19132566
20264520
21528078
221054636
232106854
244209853
258413548
2616817253
2733618758
2867212301
29134384182
30268703498
31537302782
321074437977
332148606246

[0,1,2,5,10,20,38,74,144,282,552,1086,2144,4247,
 8430,16761,33364,66479,132566,264520,528078,
 1054636,2106854,4209853,8413548,16817253,33618758,
 67212301,134384182,268703498,537302782,1074437977,
 2148606246]