A166818 - OEIS

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A166818 as a simple table

n	a(n)
1	0
2	0
3	0
4	2016
5	23485
6	139417
7	583174
8	1954280
9	5607754
10	14335198
11	33495720
12	72817584
13	149172543
14	290727879
15	543010494

[0,0,0,2016,23485,139417,583174,1954280,5607754, 14335198,33495720,72817584,149172543,290727879, 543010494]