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A140124 as a simple table

na(n)
21
320
4243
53104
646625
7823500
816777159
9387420416
109999999909
11285311670500
128916100448123
13302875106592096
1411112006825557833
15437893890380859164
1618446744073709551375
17827240261886336763904
1839346408075296537575117

[1,20,243,3104,46625,823500,16777159,387420416,
 9999999909,285311670500,8916100448123,
 302875106592096,11112006825557833,
 437893890380859164,18446744073709551375,
 827240261886336763904,39346408075296537575117]