# A191424 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 1
4 6
5 20
6 95
7 525
8 2975
9 20300
10 143640
11 1131900
12 9548385
13 86096010
14 831475645
15 8488104625
16 91828436700
17 1045926081200
18 12517301471675
19 157022728337475
20 2058625791347125
21 28160968442356750
22 401055626173702500
23 5936491984459286250