# A297197 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 10
4 34
5 146
6 752
7 4520
8 31062
9 240188
10 2063846
11 19508770
12 201184666
13 2247704104
14 27044622168
15 348654862510
16 4794539357488
17 70054014476102
18 1083796147054274
19 17698938549553490
20 304247125951777284