A166800 - OEIS

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A166800 as a simple table

n	a(n)
1	0
2	0
3	0
4	2016
5	23485
6	139417
7	583175
8	1954287
9	5607782
10	14335282
11	33495930
12	72818046
13	149173467
14	290729595
15	543013497

[0,0,0,2016,23485,139417,583175,1954287,5607782, 14335282,33495930,72818046,149173467,290729595, 543013497]