# A198891 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 7
4 32
5 180
6 1219
7 9646
8 87192
9 886536
10 10016159
11 124481258
12 1687686528
13 24787991800
14 392081193504
15 6644677619581
16 120115898158288
17 2307044712629472
18 46917527736860976
19 1007152702625923440
20 22757886107313170356
21 539955309450787483261
22 13421068671117864869156