# A109590 (b-file synthesized from sequence entry)
0 0
1 -2
2 -2
3 -3
4 -24
5 30
6 -1584
7 18648
8 -417024
9 9009792
10 -234809280
11 6704112096
12 -213138355968
13 7406611617600
14 -280001933761536
15 11429619375628800
16 -501128794469154816
17 23484526696292281344
18 -1171437744670467637248
19 61965733479803762540544