A009363 - OEIS

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A009363 as a simple table

n	a(n)
0	0
1	1
2	-2
3	9
4	-55
5	434
6	-4180
7	47590
8	-625770
9	9339880
10	-156097760
11	2889491800
12	-58706203400
13	1299203207600
14	-31115627649600
15	801958361812400
16	-22134642846706000
17	651438145653776000
18	-20365743882600064000

[0,1,-2,9,-55,434,-4180,47590,-625770,9339880, -156097760,2889491800,-58706203400,1299203207600, -31115627649600,801958361812400, -22134642846706000,651438145653776000, -20365743882600064000]