# A119021 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 14
4 44
5 152
6 564
7 2200
8 8922
9 37460
10 162526
11 726772
12 3337360
13 15676000
14 75057142
15 365302740
16 1803191210
17 9011209620
18 45528658362
19 232340523516
20 1196799936312
21 6219980254704
22 32605664415000
23 172351828064208