# A137697 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 20
4 56
5 336
6 1056
7 6864
8 22880
9 155584
10 537472
11 3762304
12 13312768
13 95091200
14 342328320
15 2481880320
16 9051563520
17 66378132480