# A049160 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 11
4 45
5 197
6 901
7 4261
8 20663
9 102191
10 513453
11 2613573
12 13449075
13 69849063
14 365658819
15 1927465339
16 10221707709
17 54498198789
18 291949801743
19 1570676592071
20 8482716335657
21 45972230344641
22 249938247763865