# A149411 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 52
5 199
6 895
7 3792
8 17523
9 77968
10 366808
11 1679585
12 7995678
13 37298169
14 179019270
15 845838011
16 4083954115
17 19474918120
18 94451708752
19 453524961665
20 2207187903123
21 10654577147427
22 51996035136325
23 252048114887290
24 1232790097312202
25 5996008969942303
26 29381370786364795
27 143297633781459588