# A155592 (b-file synthesized from sequence entry)
0 1
1 9
2 67
3 519
4 4111
5 32799
6 262207
7 2097279
8 16777471
9 134218239
10 1073742847
11 8589936639
12 68719480831
13 549755822079
14 4398046527487
15 35184372121599
16 281474976776191
17 2251799813816319
18 18014398509744127
19 144115188076380159