# A171556 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 13
4 40
5 124
6 394
7 1285
8 4288
9 14584
10 50386
11 176356
12 624034
13 2228698
14 8023318
15 29084533
16 106073008
17 388934368
18 1432916098
19 5301789568
20 19692361258
21 73398801058
22 274447690918
23 1029178840948
24 3869712441970
25 14585839204354