# A001686 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 3
4 8
5 51
6 1538
7 599871
8 19417825808
9 1573273218577214751
10 124442887685693556895657990772138
11 311057821480221188367831306672353513246409033360367599771