# A170808 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 12
5 40
6 116
7 252
8 768
9 2704
10 12756
11 63168
12 338308
13 1956876
14 11971780
15 77909884
16 535178056
17 3906154920
18 30146769464
19 244980749052
20 2094507398508