# A331685 (b-file synthesized from sequence entry)
1 1
2 3
3 7
4 23
5 69
6 261
7 943
8 3815
9 15107
10 63219
11 262791
12 1130953
13 4838813
14 21185125
15 92593943
16 411160627
17 1823656199
18 8186105099
19 36728532951
20 166310761655