A081783 - OEIS

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A081783 as a simple table

n	a(n)
0	1
1	4
2	172
3	181307
4	241328833528
5	824652019956267685427678
6	768422457901766762303892554138930904416139509281
7	2110688056630901907060877896737932376507936264268382076456539236145849709148481095915090382331184

[1,4,172,181307,241328833528, 824652019956267685427678, 768422457901766762303892554138930904416139509281, 21106880566309019070608778967379323765079362642683\ 82076456539236145849709148481095915090382331184]