# A180892 (b-file synthesized from sequence entry)
1 1
2 0
3 2
4 6
5 30
6 168
7 1078
8 7544
9 59202
10 504340
11 4724672
12 47582366
13 519090056
14 6039933544
15 75306132788
16 994433862242
17 13955352735180
18 206245134439298