A260639 - OEIS

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A260639 as a simple table

n	a(n)
1	1
2	4
3	206
4	433284
5	131782705528
6	21826979750768842816
7	7637711141088259236341772556400
8	22237835372502772582455643527946875785037270496
9	2138255561398515897400115384129197209090292453675665760256378885504

[1,4,206,433284,131782705528,21826979750768842816, 7637711141088259236341772556400, 22237835372502772582455643527946875785037270496, 21382555613985158974001153841291972090902924536756\ 65760256378885504]