# A148992 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 33
5 116
6 453
7 1750
8 7109
9 28986
10 121305
11 510680
12 2183305
13 9395165
14 40817884
15 178419362
16 785115490
17 3472402376
18 15435999223
19 68908079136
20 308841287833
21 1389102439531
22 6268241975771
23 28368390147122
24 128738944006402
25 585688702070794
26 2670712676908657
27 12204424325272461
28 55881736244853004