# A255469 (b-file synthesized from sequence entry)
0 1
1 6
2 20
3 84
4 296
5 1124
6 4056
7 15100
8 55288
9 204740
10 753336
11 2782588
12 10252952
13 37831684
14 139470616
15 514443580
16 1896954168
17 6996160196
18 25799583352
19 95147186940
20 350881763288
21 1294007162500
22 4772059430872
23 17598637988284
24 64900766401656
25 239343741625668
26 882659972822840
27 3255107458681212
28 12004301666699032