A081976 - OEIS

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A081976 as a simple table

n	a(n)
1	1
2	2
3	4
4	36
5	1288
6	3732552
7	13845944773136
8	431339599553022278260254864
9	184905369551724915055273665254253822188651964997391392

[1,2,4,36,1288,3732552,13845944773136, 431339599553022278260254864, 18490536955172491505527366525425382218865196499739\ 1392]