# A323618 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 -1
4 1
5 -1
6 -2
7 34
8 -324
9 2988
10 -28944
11 300816
12 -3371040
13 40710240
14 -528439680
15 7348717440
16 -109109064960
17 1723814265600
18 -28888702617600
19 512030734387200
20 -9572240647065600
21 188274945999974400
22 -3887144020408320000
23 84062926436751360000
24 -1900475323780239360000