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A284149 as a simple table

na(n)
16
24
38
412
516
692
764
8144
9508
10256
111024
123392
138192
143072
1513248
1619456
17114688
1881920
1965536
20262144
21671744
221048576
23983040
241835008
255296128
269437184
2716777216
2854525952
29121634816
30201326592
31587202560
32738197504
333340500992
346710886400
353959422976
364294967296
3728991029248
3818253611008
3968719476736

[6,4,8,12,16,92,64,144,508,256,1024,3392,8192,
 3072,13248,19456,114688,81920,65536,262144,671744,
 1048576,983040,1835008,5296128,9437184,16777216,
 54525952,121634816,201326592,587202560,738197504,
 3340500992,6710886400,3959422976,4294967296,
 28991029248,18253611008,68719476736]