# A052639 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 6
4 48
5 480
6 6480
7 100800
8 1774080
9 35199360
10 776563200
11 18840729600
12 498640665600
13 14297239756800
14 441470866636800
15 14605415016192000
16 515412006100992000
17 19325209343311872000
18 767215648278503424000