# A138013 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 17
4 146
5 1694
6 24834
7 440586
8 9180800
9 219829536
10 5948287560
11 179508872520
12 5978006444112
13 217772950035120
14 8614798644364080
15 367768502385434640
16 16852524904388586240
17 825075552824125305600
18 42981992589364756939008
19 2373967488394457834095872