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A064556 as a simple table

na(n)
01
1-115920
237534859200
3-30328412970240000
4-482606811957501440000
5-2983637890141033828147200000

[1,-115920,37534859200,-30328412970240000,
 -482606811957501440000,
 -2983637890141033828147200000]