# A149377 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 48
5 168
6 734
7 2901
8 12956
9 53952
10 247794
11 1076150
12 5002284
13 22265521
14 104854868
15 476333956
16 2259433082
17 10406933888
18 49727145013
19 231743193049
20 1112557697545
21 5229835292503
22 25223740295131
23 119457136172201
24 578033615443152
25 2753450989395258
26 13365420050944659
27 63989848689178980