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A081687 as a simple table

na(n)
01
12
22
320
4542
58132
694502
7964700
89138782
982619732
10724180502
116213565580
1252507598222
13438786732932
143636161064902
1529939329241660
16245281233244862
172001531240407732
1816280816416067702
19132088684297864940
201069381010972414702
218642425579112444132
2269743202133180068902

[1,2,2,20,542,8132,94502,964700,9138782,82619732,
 724180502,6213565580,52507598222,438786732932,
 3636161064902,29939329241660,245281233244862,
 2001531240407732,16280816416067702,
 132088684297864940,1069381010972414702,
 8642425579112444132,69743202133180068902]