# A318616 (b-file synthesized from sequence entry)
0 1
1 0
2 -4
3 -9
4 160
5 1350
6 -14904
7 -335160
8 1796096
9 125615448
10 204300000
11 -64591072920
12 -735003528192
13 41673388751280
14 1113912529707264
15 -30043364514345000
16 -1703374149711298560
17 17822402097051182400
18 2856178489894627203072
19 12394040043610922716800
20 -5255899207995216384000000