# A027203 (b-file synthesized from sequence entry)
2 1
3 10
4 75
5 450
6 2814
7 15202
8 89623
9 466252
10 2677281
11 13691160
12 77546684
13 393047294
14 2209036094
15 11140807218
16 62325916869
17 313402240000
18 1748294223916
19 8775335427968
20 48864101440273
21 244988564184682
22 1362584143931457