A174436 - OEIS

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A174436 as a simple table

n	a(n)
0	0
1	0
2	4
3	35
4	275
5	2206
6	18602
7	166191
8	1574415
9	15788974
10	167183914
11	1863967135
12	21822793215
13	267611755414
14	3429246890754
15	45819357151439
16	637076509210383
17	9200974953803310
18	137799616003035306

[0,0,4,35,275,2206,18602,166191,1574415,15788974, 167183914,1863967135,21822793215,267611755414, 3429246890754,45819357151439,637076509210383, 9200974953803310,137799616003035306]