A270373 - OEIS

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A270373 as a simple table

n	a(n)
1	3
2	4
3	7
4	25
5	5546
6	36482088
7	14423934280776257
8	1969937215073991451613042447271867
9	3160555685801520768089757205744771458914199650397475324265981061618

[3,4,7,25,5546,36482088,14423934280776257, 1969937215073991451613042447271867, 31605556858015207680897572057447714589141996503974\ 75324265981061618]