A067667 - OEIS

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A067667 as a simple table

n	a(n)
0	1
1	1
2	3
3	315
4	638512875
5	122529844256906551386796875
6	13757108753595648665519665029568345104465749222289382342659100341796875

[1,1,3,315,638512875,122529844256906551386796875, 13757108753595648665519665029568345104465749222289\ 382342659100341796875]