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A052944 as a simple table

na(n)
00
12
25
310
419
536
669
7134
8263
9520
101033
112058
124107
138204
1416397
1532782
1665551
17131088
18262161
19524306
201048595
212097172
224194325
238388630
2416777239
2533554456
2667108889
27134217754
28268435483
29536870940
301073741853
312147483678

[0,2,5,10,19,36,69,134,263,520,1033,2058,4107,
 8204,16397,32782,65551,131088,262161,524306,
 1048595,2097172,4194325,8388630,16777239,33554456,
 67108889,134217754,268435483,536870940,1073741853,
 2147483678]