A317377 - OEIS

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A317377 as a simple table

n	a(n)
1	1
2	4
3	18
4	123
5	2089
6	75405
7	4726521
8	569899203
9	132364711390
10	58207830722829
11	48518983884550645
12	77042834793060609587

[1,4,18,123,2089,75405,4726521,569899203, 132364711390,58207830722829,48518983884550645, 77042834793060609587]