A174809 - OEIS

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A174809 as a simple table

n	a(n)
0	1
1	4
2	68
3	3664
4	559296
5	292983296
6	677028302848
7	5742750182014976
8	140199451387306704896
9	10334993471103615132237824
10	3076052900280004094541239943168
11	3864163084421857020112275272686895104

[1,4,68,3664,559296,292983296,677028302848, 5742750182014976,140199451387306704896, 10334993471103615132237824, 3076052900280004094541239943168, 3864163084421857020112275272686895104]