# A368981 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 12
4 168
5 1720
6 33360
7 492324
8 12510848
9 242010864
10 7645282560
11 183157788220
12 6930019734528
13 198083231524776
14 8738660263983104
15 290276762478721620
16 14634486747811184640
17 554012204526293864416
18 31427811840457845964800
19 1335650409538235449288812
20 84210181959664202315202560