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A006876 as a simple table

na(n)
11
20
31
43
511
620
757
8108
9240
10472
111013
121959
134083
148052
1516315
1632496
1765519
18130464
19262125
20523209
211048353
222095084
234194281
248384100
2516777120
2633546216
2767108068
28134201223
29268435427
30536836484
311073741793
322147417952
334294964173
348589803488
3517179868739

[1,0,1,3,11,20,57,108,240,472,1013,1959,4083,8052,
 16315,32496,65519,130464,262125,523209,1048353,
 2095084,4194281,8384100,16777120,33546216,
 67108068,134201223,268435427,536836484,1073741793,
 2147417952,4294964173,8589803488,17179868739]