# A337517 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 9
5 23
6 57
7 151
8 427
9 1263
10 3823
11 11724
12 36048
13 110953
14 342079
15 1064468
16 3341067
17 10583564
18 33727683
19 107931482
20 346615834