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A199831 as a simple table

na(n)
1140
21820
321364
4273728
53579520
647040968
7622300326
88281149188
9110718596524
101486040082748
1120010711643976
12270217094416868
133657780168834780
1449618552941019396
15674346504318284036

[140,1820,21364,273728,3579520,47040968,622300326,
 8281149188,110718596524,1486040082748,
 20010711643976,270217094416868,3657780168834780,
 49618552941019396,674346504318284036]