# A001902 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 45
5 75
6 175
7 1225
8 11025
9 19845
10 43659
11 160083
12 693693
13 1288287
14 2760615
15 41409225
16 703956825
17 1329696225
18 2807136475
19 10667118605
20 44801898141
21 85530896451
22 178837328943
23 1371086188563
24 11425718238025