A218515 - OEIS

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A218515 as a simple table

n	a(n)
1	4
2	36
3	4634
4	1608968
5	3856183182
6	40522780697742
7	2345237392530015812
8	681081741849413830473468
9	1012037226170162671485394009190

[4,36,4634,1608968,3856183182,40522780697742, 2345237392530015812,681081741849413830473468, 1012037226170162671485394009190]