# A027436 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 -4
4 16
5 -80
6 432
7 -2304
8 10944
9 -35328
10 -74112
11 2736384
12 -30853632
13 238663680
14 -1247457280
15 2201247744
16 32530722816
17 -320650199040
18 156266184704
19 18314630348800
20 -20667999748096
21 -3428200020508672