# A149871 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 13
4 42
5 138
6 482
7 1674
8 6193
9 22905
10 87302
11 332124
12 1300396
13 5086323
14 20241313
15 80532296
16 325512139
17 1315265248
18 5373186309
19 21959388097
20 90618415683
21 374030443628
22 1555349602195
23 6471926603762
24 27103293936363
25 113566464857234
26 478365524549750
27 2016520963230236
28 8538774214340379