A168591 - OEIS

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A168591 as a simple table

n	a(n)
0	1
1	3
2	19
3	831
4	281907
5	764206503
6	16955359883149
7	3120135986465328015
8	4819828380706011142058787
9	63004580363300194268932114354503
10	7017256966823394610075464951176481843849

[1,3,19,831,281907,764206503,16955359883149, 3120135986465328015,4819828380706011142058787, 63004580363300194268932114354503, 7017256966823394610075464951176481843849]