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A006300 as a simple table

na(n)
21
320
4307
54280
656914
7736568
89370183
9117822512
101469283166
1118210135416
12224636864830
132760899996816
1433833099832484
15413610917006000
165046403030066927
1761468359153954656
18747672504476150374
199083423595292949240
20110239596847544663002
211336700736225591436496
2216195256987701502444284

[1,20,307,4280,56914,736568,9370183,117822512,
 1469283166,18210135416,224636864830,2760899996816,
 33833099832484,413610917006000,5046403030066927,
 61468359153954656,747672504476150374,
 9083423595292949240,110239596847544663002,
 1336700736225591436496,16195256987701502444284]