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A339786 as a simple table

na(n)
10
20
31
49
563
6412
72673
817571
9117365
10798819
115530122
1238908380
13277750749
142009160864
1514707923021
16108835512411
17813241695330
186130521151377
1946584949832013
20356571373433217
212747371943624943
2221296479544449677
23165994877608025730
241300408539157086640

[0,0,1,9,63,412,2673,17571,117365,798819,5530122,
 38908380,277750749,2009160864,14707923021,
 108835512411,813241695330,6130521151377,
 46584949832013,356571373433217,2747371943624943,
 21296479544449677,165994877608025730,
 1300408539157086640]