# A046633 (b-file synthesized from sequence entry)
0 1
1 5
2 21
3 101
4 505
5 2521
6 12601
7 63005
8 315021
9 1575101
10 7875505
11 39377521
12 196887601
13 984438005
14 4922190021
15 24610950101
16 123054750505
17 615273752521
18 3076368762601
19 15381843813005
20 76909219065021
21 384546095325101