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A006420 as a simple table

na(n)
21
316
4150
51104
67077
741504
8228810
91205520
106135690
1130391520
12147277676
13700990752
143286733805
1515215673408
1669675615234
17316058238864
181421891923038
196350464644960
2028179908990772
21124327908683616
22545691921346146
232383936774151616
2410370479696102500

[1,16,150,1104,7077,41504,228810,1205520,6135690,
 30391520,147277676,700990752,3286733805,
 15215673408,69675615234,316058238864,
 1421891923038,6350464644960,28179908990772,
 124327908683616,545691921346146,2383936774151616,
 10370479696102500]