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A101926 as a simple table

na(n)
02
14
216
332
4256
5512
62048
74096
865536
9131072
10524288
111048576
128388608
1316777216
1467108864
15134217728
164294967296
178589934592
1834359738368
1968719476736
20549755813888
211099511627776
224398046511104
238796093022208

[2,4,16,32,256,512,2048,4096,65536,131072,524288,
 1048576,8388608,16777216,67108864,134217728,
 4294967296,8589934592,34359738368,68719476736,
 549755813888,1099511627776,4398046511104,
 8796093022208]