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A347212 as a simple table

na(n)
01
12
23
36
411
518
636
769
8131
9258
10522
111025
122054
134101
148194
1516394
1632817
1765542
18131085
19262183
20524313
211048588
222097164
234194310
248388624
2516777218
2633554433
2767108881
28134217730
29268435473
30536870927
311073741861

[1,2,3,6,11,18,36,69,131,258,522,1025,2054,4101,
 8194,16394,32817,65542,131085,262183,524313,
 1048588,2097164,4194310,8388624,16777218,33554433,
 67108881,134217730,268435473,536870927,1073741861]