# A084900 (b-file synthesized from sequence entry)
0 0
1 1
2 11
3 72
4 378
5 1755
6 7533
7 30618
8 119556
9 452709
10 1673055
11 6062364
12 21611934
13 75996063
14 264126177
15 908764110
16 3099363912
17 10489051017
18 35255264499
19 117775828656
20 391294693890
21 1293597012771
22 4257363753621
23 13954111172802