# A067646 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 8
4 24
5 72
6 264
7 1074
8 4490
9 20296
10 92768
11 439148
12 2118654
13 10377708
14 51740280
15 260545092
16 1328891356
17 6836872181