# A215397 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 3
5 6
6 26
7 84
8 324
9 1170
10 4412
11 16313
12 61138
13 227383
14 849667
15 3168419
16 11831104
17 44144206
18 164792736
19 615027929
20 2295714687