# A148937 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 28
5 102
6 378
7 1408
8 5508
9 22306
10 89503
11 365635
12 1539892
13 6456566
14 27184822
15 116960718
16 503981206
17 2171078298
18 9476079313
19 41546823539
20 182158914880
21 804098318961
22 3566738165143
23 15847037113039
24 70629009783914
25 315975013994710
26 1417702911326918
27 6371060606606075
28 28700191152776997