# A257216 (b-file synthesized from sequence entry)
0 1
1 1
2 13
3 61
4 641
5 7361
6 97885
7 1649229
8 30854689
9 642843937
10 15224371661
11 389990888189
12 10993271348449
13 335483217883425
14 11002846829430877
15 387486984911220301
16 14537292404339654849
17 579695285888792228033
18 24479882396099586816013
19 1090912648729168031393853
20 51183198861577845151704001