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A005270 as a simple table

na(n)
21
31
41
52
66
727
8177
91680
1023009
11455368
1213067353
13546378617
1433472296082
153021920660821
16404374532614122
1780646410554881100
1824095492607316134304
1910837141045948365696938
207369252748590790186483284
217606603491185739308318700818

[1,1,1,2,6,27,177,1680,23009,455368,13067353,
 546378617,33472296082,3021920660821,
 404374532614122,80646410554881100,
 24095492607316134304,10837141045948365696938,
 7369252748590790186483284,
 7606603491185739308318700818]