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A006682 as a simple table

na(n)
21
34
420
5155
61716
724654
8434155
99043990
10217457456
115926620029
12180538177590
136078622845750
14224156328707221
158984765008810504
16388939866084222200
1718083736252080051435
18898779656769444326136
1947551736771345760732954

[1,4,20,155,1716,24654,434155,9043990,217457456,
 5926620029,180538177590,6078622845750,
 224156328707221,8984765008810504,
 388939866084222200,18083736252080051435,
 898779656769444326136,47551736771345760732954]