# A024330 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 -3
4 7
5 -10
6 -18
7 168
8 360
9 -19008
10 262080
11 -2724480
12 25194240
13 -232951680
14 2505444480
15 -34676812800
16 577980748800
17 -10296734515200
18 185178186547200
19 -3347775973785600
20 62005095419904000
21 -1204098364514304000