# A318433 (b-file synthesized from sequence entry)
0 1
1 5
2 20
3 155
4 1220
5 10630
6 98900
7 960650
8 9613700
9 98462675
10 1027222520
11 10877596900
12 116613287300
13 1263159501180
14 13803839298920
15 152000845788280
16 1684888825463940
17 18785707522181965
18 210536007879090140
19 2370423142929112065
20 26799168520704093720