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A086228 as a simple table

n a(n)
0 1
1 3
2 15
3 140
4 2520
5 88704
6 6150144
7 843448320
8 229417943040
9 123987652771840
10 133311524260282368
11 285432092670742757376
12 1217843595395169098137600
13 10360289146303272377017958400
14 175805226564926843718814452940800

[1,3,15,140,2520,88704,6150144,843448320,
 229417943040,123987652771840,133311524260282368,
 285432092670742757376,1217843595395169098137600,
 10360289146303272377017958400,
 175805226564926843718814452940800]

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Last modified June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)