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A138764 as a simple table

na(n)
01
12
216
3248
45824
5184512
67379200
7356956672
820274442240
91322971320320
1097542692798464
118020249539919872
12727662513046159360
1372215332738579824640
147782298855258810482688
15905031449967822916026368

[1,2,16,248,5824,184512,7379200,356956672,
 20274442240,1322971320320,97542692798464,
 8020249539919872,727662513046159360,
 72215332738579824640,7782298855258810482688,
 905031449967822916026368]