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A133025 as a simple table

na(n)
11
22
34
48
516
632
764
8128
9256
10512
111024
122048
134096
148191
1516382
1632764
1765528
18131056
19262112
20524224
211048448
222096896
234193792
248387584
2516775168
2633550336

[1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8191,
 16382,32764,65528,131056,262112,524224,1048448,
 2096896,4193792,8387584,16775168,33550336]