A092123 - OEIS

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A092123 as a simple table

n	a(n)
0	1
1	1
2	2
3	10
4	302
5	391232
6	912140731560
7	6870302396056798235043564
8	552249828443015013351729477795257932661645918815144

[1,1,2,10,302,391232,912140731560, 6870302396056798235043564, 55224982844301501335172947779525793266164591881514\ 4]