# A137550 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 5
4 14
5 43
6 144
7 522
8 2030
9 8398
10 36714
11 168793
12 813112
13 4091735
14 21451972
15 116891160
16 660554822
17 3863775322
18 23353384298
19 145634065581
20 935743895590
21 6187151514364
22 42050180222692
23 293448121230999
24 2100678197412864