# A107704 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 3
4 8
5 26
6 107
7 492
8 2481
9 13599
10 81288
11 531343
12 3790344
13 29279668
14 242278645
15 2125160800
16 19608039385
17 189437263949
18 1912477987102
19 20161911603747
20 221869317899264
21 2546362514225134
22 30430660439311103