# A149471 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 13
4 55
5 206
6 929
7 3854
8 17797
9 77497
10 364043
11 1636237
12 7772563
13 35679961
14 170863707
15 796256786
16 3836089543
17 18077155221
18 87495240136
19 415839255346
20 2020128721725
21 9665396470341
22 47094220547527
23 226531339610481
24 1106476770045798
25 5345538685045776
26 26163552380725908
27 126854484533770709