A028670 - OEIS

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A028670 as a simple table

n	a(n)
0	1
1	56
2	225792
3	59074412544
4	990862210530017280
5	1063897728694258113372487680
6	73110216322082119251081045710796226560
7	321541978498155599038038914825594113520368216965120

[1,56,225792,59074412544,990862210530017280, 1063897728694258113372487680, 73110216322082119251081045710796226560, 32154197849815559903803891482559411352036821696512\ 0]