A194536 - OEIS

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A194536 as a simple table

n	a(n)
1	1
2	4
3	131
4	43785
5	79201795
6	627974590650
7	21399815343394998
8	3132305932642809585983
9	1969210116072259125767299138

[1,4,131,43785,79201795,627974590650, 21399815343394998,3132305932642809585983, 1969210116072259125767299138]