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A151821 as a simple table

na(n)
11
24
38
416
532
664
7128
8256
9512
101024
112048
124096
138192
1416384
1532768
1665536
17131072
18262144
19524288
201048576
212097152
224194304
238388608
2416777216
2533554432
2667108864
27134217728
28268435456
29536870912
301073741824
312147483648
324294967296
338589934592

[1,4,8,16,32,64,128,256,512,1024,2048,4096,8192,
 16384,32768,65536,131072,262144,524288,1048576,
 2097152,4194304,8388608,16777216,33554432,
 67108864,134217728,268435456,536870912,1073741824,
 2147483648,4294967296,8589934592]