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A128543 as a simple table

na(n)
11
26
318
448
5120
6288
7672
81536
93456
107680
1116896
1236864
1379872
14172032
15368640
16786432
171671168
183538944
197471104
2015728640
2133030144
2269206016
23144703488
24301989888
25629145600
261308622848
272717908992
285637144576

[1,6,18,48,120,288,672,1536,3456,7680,16896,36864,
 79872,172032,368640,786432,1671168,3538944,
 7471104,15728640,33030144,69206016,144703488,
 301989888,629145600,1308622848,2717908992,
 5637144576]