# A177774 (b-file synthesized from sequence entry)
1 1
2 1
3 -2
4 12
5 -120
6 1684
7 -31120
8 730167
9 -21231238
10 750298888
11 -31687276404
12 1575667784824
13 -91052587870552
14 6045175643449008
15 -456560323906523200
16 38886167319641201692
17 -3706800668529432678016
18 392824268201002386964776