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A191997 as a simple table

na(n)
21
32
432
5128
6512
78192
82097152
9226492416
10301989888
11536870912
1232212254720
138349416423424
144453022092492800
151122161567308185600
162294196982052290560
1712235717237612216320
1816314289650149621760
1958731442740538638336000
2051166832915557261718323200

[1,2,32,128,512,8192,2097152,226492416,301989888,
 536870912,32212254720,8349416423424,
 4453022092492800,1122161567308185600,
 2294196982052290560,12235717237612216320,
 16314289650149621760,58731442740538638336000,
 51166832915557261718323200]