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A001420 as a simple table

na(n)
12
23
36
414
536
694
7250
8675
91838
105053
1114016
1239169
13110194
14311751
15886160
162529260
177244862
1820818498
1959994514
20173338962
21501994070
221456891547
234236446214
2412341035217
2536009329450
26105229462401
27307942754342
28902338712971
292647263986022
307775314024683
3122861250676074
3267284446545605

[2,3,6,14,36,94,250,675,1838,5053,14016,39169,
 110194,311751,886160,2529260,7244862,20818498,
 59994514,173338962,501994070,1456891547,
 4236446214,12341035217,36009329450,105229462401,
 307942754342,902338712971,2647263986022,
 7775314024683,22861250676074,67284446545605]