A145075 - OEIS

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A145075 as a simple table

n	a(n)
0	1
1	4
2	18
3	172
4	1881
5	25644
6	411488
7	7581792
8	157296141
9	3630709734
10	92225760033
11	2556393882912
12	76774488792326
13	2483261807354874

[1,4,18,172,1881,25644,411488,7581792,157296141, 3630709734,92225760033,2556393882912, 76774488792326,2483261807354874]