# A009645 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 -6
4 30
5 -180
6 1324
7 -11424
8 113376
9 -1271232
10 15889280
11 -218989760
12 3298513600
13 -53897151360
14 949389619840
15 -17931842342400
16 361486218406400
17 -7746121344512000
18 175813073606092800
19 -4213227577441536000