# A013010 (b-file synthesized from sequence entry)
0 0
1 1
2 -2
3 6
4 -24
5 148
6 -1040
7 9184
8 -91840
9 1066640
10 -13775872
11 199000736
12 -3146553344
13 54431471040
14 -1017854502912
15 20523724218880
16 -442966494683136
17 10203766053312768
18 -249626351047671808