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A376420 as a simple table

na(n)
23
39
436
5162
6800
75248
841984
9364544
103639168
1139937536
12479250432
136227066880
1487178936320
151307674935296
1620922798964736
17355687506903040

[3,9,36,162,800,5248,41984,364544,3639168,
 39937536,479250432,6227066880,87178936320,
 1307674935296,20922798964736,355687506903040]