# A167018 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 20
4 149
5 1491
6 18612
7 275856
8 4699180
9 89993827
10 1907644760
11 44253266889
12 1113845999245
13 30214252304871
14 878483783958444
15 27252652393849400
16 898540310823301994
17 31378570076570865074
18 1157108876622296079054