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A022220 as a simple table

na(n)
21
343
41591
557535
62072815
774630671
82686760143
996723701071
103482055254095
11125354001240655
124512744117222991
13162458788655384143
145848516394205967951
15210546590207087679055
167579677247549193442895
17272868380912335185925711

[1,43,1591,57535,2072815,74630671,2686760143,
 96723701071,3482055254095,125354001240655,
 4512744117222991,162458788655384143,
 5848516394205967951,210546590207087679055,
 7579677247549193442895,272868380912335185925711]