A342907 - OEIS

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A342907 as a simple table

n	a(n)
1	1
2	4
3	20
4	304
5	6784
6	407684
7	39072966
8	9449433606
9	3830070645700
10	3762885306351756
11	6402694828334379856
12	25695884677997378383120

[1,4,20,304,6784,407684,39072966,9449433606, 3830070645700,3762885306351756, 6402694828334379856,25695884677997378383120]