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A068200 as a simple table

na(n)
01
12
26
324
4120
5696
64536
732568
8254136
92133816
1019130040
11182000952
121828296888
1319311334200
14213709376184
152470302259512
1629746381049016
17372270346391352
184831940144914104
1964925998174811448
20901626111996723384
2112920858504042924856

[1,2,6,24,120,696,4536,32568,254136,2133816,
 19130040,182000952,1828296888,19311334200,
 213709376184,2470302259512,29746381049016,
 372270346391352,4831940144914104,
 64925998174811448,901626111996723384,
 12920858504042924856]