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A000631 as a simple table

na(n)
21
31
43
55
613
727
866
9153
10377
11914
122281
135690
1414397
1536564
1693650
17240916
18623338
191619346
204224993
2111062046
2229062341
2376581151
24202365823
25536113477
261423665699
273788843391
2810103901486
2926995498151
3072253682560
31193706542776

[1,1,3,5,13,27,66,153,377,914,2281,5690,14397,
 36564,93650,240916,623338,1619346,4224993,
 11062046,29062341,76581151,202365823,536113477,
 1423665699,3788843391,10103901486,26995498151,
 72253682560,193706542776]