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A162442 as a simple table

na(n)
22
316
448
5512
61280
72048
814336
9262144
10589824
112621440
125767168
1350331648
14109051904
15469762048
1667108864
1734359738368
1873014444032
19103079215104
20652835028992
211099511627776
223848290697216
2348378511622144

[2,16,48,512,1280,2048,14336,262144,589824,
 2621440,5767168,50331648,109051904,469762048,
 67108864,34359738368,73014444032,103079215104,
 652835028992,1099511627776,3848290697216,
 48378511622144]