# A197772 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 25
5 138
6 968
7 8313
8 84735
9 1000322
10 13418848
11 201526744
12 3348677251
13 60981586323
14 1207531891440
15 25829355773719
16 593485342700358
17 14577731251921826
18 381175458103542506
19 10570762449548976706
20 309889778765890035970
21 9575316933047901325098