# A155599 (b-file synthesized from sequence entry)
0 1
1 7
2 61
3 505
4 4081
5 32737
6 262081
7 2097025
8 16776961
9 134217217
10 1073740801
11 8589932545
12 68719472641
13 549755805697
14 4398046494721
15 35184372056065
16 281474976645121
17 2251799813554177
18 18014398509219841
19 144115188075331585