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A038791 as a simple table

na(n)
22
34
412
5104
6344
74096
814572
9190652
109586984
1135791472
121908874584
1327487790720
14104715393912
151529755308212
1686607685141744
174969489243995032
1819215358410149344
191117984489315857512
2016865594581677305360
2165588423373189982912

[2,4,12,104,344,4096,14572,190652,9586984,
 35791472,1908874584,27487790720,104715393912,
 1529755308212,86607685141744,4969489243995032,
 19215358410149344,1117984489315857512,
 16865594581677305360,65588423373189982912]