# A181301 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 20
4 64
5 206
6 662
7 2128
8 6840
9 21986
10 70670
11 227156
12 730152
13 2346942
14 7543822
15 24248256
16 77941648
17 250529378
18 805281526
19 2588432308
20 8320049072
21 26743297998
22 85961510758
23 276307781200
24 888141556360
25 2854770939522