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A270126 as a simple table

na(n)
01
15
224
396
4384
51536
66144
724576
898304
9393216
101572864
116291456
1225165824
13100663296
14402653184
151610612736

[1,5,24,96,384,1536,6144,24576,98304,393216,
 1572864,6291456,25165824,100663296,402653184,
 1610612736]