# A220747 (b-file synthesized from sequence entry)
0 1
1 3
2 15
3 105
4 315
5 3465
6 45045
7 135135
8 2297295
9 43648605
10 130945815
11 3011753745
12 75293843625
13 225881530875
14 6550564395375
15 203067496256625
16 609202488769875
17 21322087106945625
18 788917222956988125