A320989 - OEIS

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A320989 as a simple table

n	a(n)
0	0
1	1
2	7
3	50
4	2457
5	842801
6	14164958864
7	81658169024988865
8	7911779188478711198209076919
9	4419091543264985265125879423229594334610523298
10	239147782774557159658813554446871692442583155391399547503168277134702036921

[0,1,7,50,2457,842801,14164958864, 81658169024988865,7911779188478711198209076919, 4419091543264985265125879423229594334610523298, 23914778277455715965881355444687169244258315539139\ 9547503168277134702036921]