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A323948 as a simple table

na(n)
01
12
24
38
426
531
664
7156
8218
9521
101048
112014
124096
138291
1426384
1531768
1665536
17161244
18232071
19514188
201097251
212048576
224294304
238388608
2426777126
2533554431
2667208864
27168435456
28234127718
29536870921
301247483648
312073742814
324194967196
338589934591
3427279869284
3534359738368
3668729476736
37174877906944

[1,2,4,8,26,31,64,156,218,521,1048,2014,4096,8291,
 26384,31768,65536,161244,232071,514188,1097251,
 2048576,4294304,8388608,26777126,33554431,
 67208864,168435456,234127718,536870921,1247483648,
 2073742814,4194967196,8589934591,27279869284,
 34359738368,68729476736,174877906944]