# A012790 (b-file synthesized from sequence entry)
0 1
1 2
2 -20
3 -1104
4 -23728
5 2048224
6 394518592
7 28921612032
8 -3968669081344
9 -2038929577444864
10 -347998546570798080
11 59058720637105172480
12 67936182152875665510400
13 22515279368057454566531072