# A112807 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 13
4 66
5 365
6 2132
7 12940
8 80804
9 515776
10 3350165
11 22071930
12 147141469
13 990714900
14 6727506071
15 46020535285
16 316837676938
17 2193700600205
18 15265011340106
19 106699930507346
20 748827090415380
21 5274495878205514