# A148474 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 20
5 65
6 241
7 889
8 3472
9 13622
10 55340
11 225557
12 940725
13 3937330
14 16738031
15 71404967
16 307999065
17 1332931401
18 5815439839
19 25450058722
20 112060278048
21 494798567807
22 2195172975521
23 9763509301815
24 43589884062136
25 195052842541424
26 875498008541850
27 3937713690439906
28 17755851945737789