# A067645 (b-file synthesized from sequence entry)
0 0
1 1
2 1
3 3
4 9
5 21
6 101
7 346
8 1576
9 7040
10 31556
11 153916
12 724758
13 3610768
14 17853814
15 90220450
16 460221672
17 2365627740
18 12300901598