# A149873 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 13
4 42
5 138
6 491
7 1734
8 6592
9 24830
10 96763
11 378378
12 1522997
13 6125484
14 24995807
15 102864877
16 427821311
17 1785014345
18 7503833522
19 31780141158
20 135203016714
21 577262116273
22 2478171737927
23 10689904205292
24 46240610852179
25 200652119456436
26 874430567808585
27 3821828494391071
28 16740354639430228