A086348 - OEIS

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A086348 as a simple table

n	a(n)
0	1
1	8
2	32
3	168
4	784
5	3840
6	18432
7	89216
8	430336
9	2078720
10	10035200
11	48457728
12	233967616
13	1129709568
14	5454692352
15	26337640448
16	127169265664
17	614027755520
18	2964787822592
19	14315262836736

[1,8,32,168,784,3840,18432,89216,430336,2078720, 10035200,48457728,233967616,1129709568,5454692352, 26337640448,127169265664,614027755520, 2964787822592,14315262836736]