A320627 - OEIS

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A320627 as a simple table

n	a(n)
0	1
1	1
2	1
3	13
4	217
5	12938197
6	913083596083
7	3836387399699939518675459471
8	18744974860247264575032720770000376335095039
9	25741458812593689971179132474269180614331431944325835714919500509967358371226305360396760987

[1,1,1,13,217,12938197,913083596083, 3836387399699939518675459471, 18744974860247264575032720770000376335095039, 25741458812593689971179132474269180614331431944325\ 835714919500509967358371226305360396760987]