# A115108 (b-file synthesized from sequence entry)
0 1
1 4
2 16
3 56
4 156
5 248
6 1584
7 2248
8 18512
9 51856
10 189440
11 609664
12 2023808
13 6579712
14 21441536
15 69575680
16 225665024
17 731127808
18 2367905792
19 7666302976
20 24816189440
21 80321511424
22 259955621888
23 841292972032
24 2722599796736