# A013080 (b-file synthesized from sequence entry)
0 1
1 0
2 -4
3 6
4 69
5 -330
6 -2700
7 29925
8 164745
9 -4116420
10 -9894150
11 791943075
12 -1224167175
13 -199738989450
14 1368120253500
15 62416549069875
16 -901935831171375
17 -22756961540313000
18 604804116364197750