# A071727 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 15
4 45
5 141
6 457
7 1520
8 5159
9 17797
10 62218
11 219946
12 784890
13 2823666
14 10229733
15 37289210
16 136665195
17 503301525
18 1861550310
19 6912114330
20 25755891510
21 96279420870
22 360961760250
23 1356920443944
24 5113523451462