# A293568 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 -6
4 0
5 0
6 360
7 -5040
8 0
9 -60480
10 3628800
11 -39916800
12 19958400
13 -3113510400
14 130767436800
15 -1318571654400
16 3487131648000
17 -355687428096000
18 12813639597158400
19 -126713646259200000
20 1013709170073600000
21 -85161707377883136000
22 2819368492175499264000