# A012749 (b-file synthesized from sequence entry)
0 1
1 -1
2 9
3 -225
4 6993
5 -592545
6 38019993
7 -7568120833
8 704958936737
9 -307874830583745
10 28902473366214185
11 -31727751790145150113
12 1072204316646061940721
13 -7192967681050724533661025