# A129324 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 6
4 36
5 220
6 1410
7 9534
8 68040
9 511704
10 4046310
11 33560010
12 291244668
13 2638581972
14 24901833866
15 244333004790
16 2487900487440
17 26245651191600
18 286408960814862
19 3228529392965250
20 37544229610105220
21 449858650676764140