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A181621 as a simple table

na(n)
12
21
31
46
52
622
754
83
968
10403
11914
126
13192
142228
1510886
1621874
179
18512
199721
2085974
21360071
22676326
2318
241312
2537736
26526760
273809428
2814229762
2925392410

[2,1,1,6,2,22,54,3,68,403,914,6,192,2228,10886,
 21874,9,512,9721,85974,360071,676326,18,1312,
 37736,526760,3809428,14229762,25392410]