# A149920 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 15
4 47
5 157
6 556
7 2019
8 7584
9 29152
10 113984
11 453620
12 1829076
13 7459678
14 30755525
15 127897631
16 536170959
17 2264041183
18 9619849541
19 41113706454
20 176630946692
21 762409276043
22 3305293076682
23 14386354109668
24 62846284893256
25 275475587203370
26 1211274147573245
27 5341553425781988