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A004370 as a simple table

na(n)
21
321
4378
56545
6111930
71906884
832468436
9553270671
109440350920
11161322559475
122761025887620
1347325339895743
14812325612855848
1513961746143269400
16240260199935164200
174139207762053520646

[1,21,378,6545,111930,1906884,32468436,553270671,
 9440350920,161322559475,2761025887620,
 47325339895743,812325612855848,13961746143269400,
 240260199935164200,4139207762053520646]