# A253208 (b-file synthesized from sequence entry)
0 4
1 7
2 19
3 67
4 259
5 1027
6 4099
7 16387
8 65539
9 262147
10 1048579
11 4194307
12 16777219
13 67108867
14 268435459
15 1073741827
16 4294967299
17 17179869187
18 68719476739
19 274877906947
20 1099511627779
21 4398046511107
22 17592186044419
23 70368744177667
24 281474976710659