A305001 - OEIS

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A305001 as a simple table

n	a(n)
0	1
1	0
2	1
3	5
4	87
5	6398
6	7745253
7	2414573042063
8	56130437190053518791691
9	286386577668298410118121281898931424413687

[1,0,1,5,87,6398,7745253,2414573042063, 56130437190053518791691, 286386577668298410118121281898931424413687]