A081046 - OEIS

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A081046 as a simple table

n	a(n)
0	1
1	-2
2	5
3	-17
4	74
5	-394
6	2484
7	-18108
8	149904
9	-1389456
10	14257440
11	-160460640
12	1965444480
13	-26029779840
14	370643938560
15	-5646837369600
16	91657072281600
17	-1579093018675200
18	28779361764249600
19	-553210247226470400

[1,-2,5,-17,74,-394,2484,-18108,149904,-1389456, 14257440,-160460640,1965444480,-26029779840, 370643938560,-5646837369600,91657072281600, -1579093018675200,28779361764249600, -553210247226470400]