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A105024 as a simple table

na(n)
00
12
24
310
416
534
668
7130
8256
9514
101028
112058
124096
138194
1416388
1532770
1665536
17131074
18262148
19524298
201048592
212097154
224194308
238388610
2416777216
2533554434
2667108868
27134217738
28268435456
29536870914
301073741828
312147483650
324294967296
338589934594

[0,2,4,10,16,34,68,130,256,514,1028,2058,4096,
 8194,16388,32770,65536,131074,262148,524298,
 1048592,2097154,4194308,8388610,16777216,33554434,
 67108868,134217738,268435456,536870914,1073741828,
 2147483650,4294967296,8589934594]