# A050181 (b-file synthesized from sequence entry)
0 0
1 1
2 3
3 9
4 30
5 99
6 333
7 1144
8 3978
9 13995
10 49742
11 178296
12 643842
13 2340135
14 8554275
15 31429026
16 115997970
17 429874830
18 1598952366
19 5967382200
20 22338765540
21 83859016527
22 315614844558
23 1190680751376
24 4501802223090
25 17055399281284