# A003494 (b-file synthesized from sequence entry)
0 1
1 8
2 56
3 384
4 2536
5 16512
6 105664
7 669696
8 4201832
9 26183808
10 162073408
11 998129664
12 6117389760
13 37346353152
14 227164816896
15 1377490599936
16 8328848160360