# A020108 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 1
5 3
6 15
7 92
8 649
9 5253
10 47802
11 482797
12 5359036
13 64844333
14 849460757
15 11977396666
16 180858689642
17 2911824903230
18 49792205845229
19 901238925798639
20 17213663482753994
21 345994636003355265
22 7300486819670796088