A156670 - OEIS

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A156670 as a simple table

n	a(n)
1	1
2	11
3	1169341
4	20188985439712961
5	3506790234728288196345900732301
6	5190947078637547438603476743093680561
7	1041849413143039115171399776907273433339109867252078165841

[1,11,1169341,20188985439712961, 3506790234728288196345900732301, 5190947078637547438603476743093680561, 10418494131430391151713997769072734333391098672520\ 78165841]