# A381913 (b-file synthesized from sequence entry)
0 1
1 4
2 28
3 245
4 2422
5 25860
6 291106
7 3405405
8 41014131
9 505344113
10 6341182427
11 80768735045
12 1041645452650
13 13575670575944
14 178528253213469
15 2366073408348545
16 31571528771106126
17 423794981085407622
18 5718929869862880055
19 77539914280883389432
20 1055790501909183080512