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A218826 as a simple table

na(n)
11
21
34
425
5217
62470
735647
8637129
913843948
10360022957
1111054457253
12396003680518
1316377463914091
14774714094061221
1541572230979229284
162512149910125036865
17169831839578092130017
1812769241823369505582150
191062122471116082751430087
2097264621940872013476357969

[1,1,4,25,217,2470,35647,637129,13843948,
 360022957,11054457253,396003680518,16377463914091,
 774714094061221,41572230979229284,
 2512149910125036865,169831839578092130017,
 12769241823369505582150,1062122471116082751430087,
 97264621940872013476357969]