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A086487 as a simple table

n a(n)
1 2
2 0
3 30
4 1122
5 2730
6 72930
7 870870
8 9699690
9 340510170
10 9592993410
11 265257422430
12 8624101075590
13 304250263527210
14 14299762385778870
15 1164365758518632670
16 43657174563782890110
17 1987938667108592728530

[2,0,30,1122,2730,72930,870870,9699690,340510170,
 9592993410,265257422430,8624101075590,
 304250263527210,14299762385778870,
 1164365758518632670,43657174563782890110,
 1987938667108592728530]

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Last modified August 22 00:43 EDT 2019. Contains 326169 sequences. (Running on oeis4.)