# A351734 (b-file synthesized from sequence entry)
0 1
1 0
2 6
3 9
4 120
5 555
6 5148
7 39711
8 378528
9 3715011
10 39838260
11 452684463
12 5463506304
13 69553644771
14 930940368036
15 13054086036855
16 191222363275968
17 2918620069099395
18 46309955947643124
19 762335523354333855
20 12995722456718984160
21 229045407317491457763