# A058820 (b-file synthesized from sequence entry)
0 1
1 5
2 15
3 85
4 475
5 2501
6 13045
7 66965
8 341875
9 1736125
10 8789377
11 44389205
12 223796925
13 1126802885
14 5667555805
15 28483073133
16 143051171875
17 718060661765
18 3602769749125
19 18069618626645
20 90599060546905
21 454130626863845
22 2275813711825285
23 11402627696161685
24 57121117919938125