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A354255 as a simple table

na(n)
12
24
38
416
526
632
764
8128
9206
10256
11478
12512
13998
141024
152048
163134
174096
186514
198192
2013942
2116384
2228894
2332768
2460518
2565536
26126634
27131072
28261398
29262144

[2,4,8,16,26,32,64,128,206,256,478,512,998,1024,
 2048,3134,4096,6514,8192,13942,16384,28894,32768,
 60518,65536,126634,131072,261398,262144]