# A181326 (b-file synthesized from sequence entry)
0 0
1 2
2 8
3 40
4 168
5 696
6 2776
7 10864
8 41800
9 158816
10 597176
11 2226512
12 8242344
13 30328160
14 111013784
15 404518640
16 1468154504
17 5309771264
18 19143323000
19 68823556368
20 246805713000
21 883028659744
22 3152718627672
23 11234773009200