A270399 - OEIS

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A270399 as a simple table

n	a(n)
1	4
2	8
3	58
4	3187
5	26014258
6	805913952665635
7	7410387900681290004146581487874
8	225626498489175680538187083509092039871425276073451202627537554

[4,8,58,3187,26014258,805913952665635, 7410387900681290004146581487874, 22562649848917568053818708350909203987142527607345\ 1202627537554]