A133396 - OEIS

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A133396 as a simple table

n	a(n)
0	1
1	4
2	81
3	43128
4	1722956401
5	9630434792858894
6	1235503220193981431307451
7	61759327252359410027162794921421520
8	49994647985559475167984891269046177019791724417

[1,4,81,43128,1722956401,9630434792858894, 1235503220193981431307451, 61759327252359410027162794921421520, 49994647985559475167984891269046177019791724417]