# A346409 (b-file synthesized from sequence entry)
0 0
1 1
2 -3
3 13
4 -52
5 476
6 1344
7 156192
8 6935424
9 470168064
10 38948065920
11 3979380286080
12 489922581219840
13 71586095491054080
14 12249193741572372480
15 2426646293132502067200
16 551096248249459158220800
17 142236660450422499604070400
18 41404182857569072540171468800