# A149988 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 17
4 57
5 197
6 727
7 2749
8 10427
9 40413
10 160104
11 635452
12 2540981
13 10308191
14 41986778
15 171455171
16 706159913
17 2922368795
18 12112409612
19 50441850877
20 210971954246
21 883890089373
22 3713026773797
23 15649807553384
24 66089155172539
25 279569747937615
26 1185459574168434
27 5036367375807659