# A020096 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 5
4 17
5 78
6 449
7 3060
8 23920
9 210930
10 2070941
11 22403815
12 264772350
13 3393900116
14 46897528867
15 694936109572
16 10992625733215
17 184875978240421
18 3294153794102035
19 61989985034465560
20 1228528794319408361
21 25575735809013137690
22 558016054014832095049