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A081691 as a simple table

na(n)
00
12
26
311
420
538
671
7136
8265
9523
101036
112061
124110
138207
1416400
1532785
1665554
17131092
18262165
19524310
201048599
212097176
224194329
238388634
2416777243
2533554460
2667108893
27134217758
28268435487
29536870944
301073741857
312147483682

[0,2,6,11,20,38,71,136,265,523,1036,2061,4110,
 8207,16400,32785,65554,131092,262165,524310,
 1048599,2097176,4194329,8388634,16777243,33554460,
 67108893,134217758,268435487,536870944,1073741857,
 2147483682]