# A013125 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 -16
4 42
5 492
6 -3210
7 -30168
8 404264
9 2783952
10 -75206520
11 -292604288
12 19217701008
13 3111794272
14 -6389076941520
15 29520888356032
16 2643629755167360
17 -29037077579992832
18 -1307061634619873664