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A017780 as a simple table

na(n)
01
164
22016
341664
4635376
57624512
674974368
7621216192
84426165368
927540584512
10151473214816
11743595781824
123284214703056
1313136858812224
1447855699958816
15159518999862720
16488526937079580
171379370175283520
183601688791018080

[1,64,2016,41664,635376,7624512,74974368,
 621216192,4426165368,27540584512,151473214816,
 743595781824,3284214703056,13136858812224,
 47855699958816,159518999862720,488526937079580,
 1379370175283520,3601688791018080]