# A073431 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 3
5 6
6 12
7 28
8 65
9 160
10 408
11 1074
12 2898
13 7998
14 22508
15 64426
16 187251
17 551730
18 1645840
19 4964876
20 15130808
21 46545788
22 144424944
23 451715460