A231082 - OEIS

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A231082 as a simple table

n	a(n)
1	0
2	2
3	50
4	136
5	2820
6	38000
7	421920
8	6118120
9	80521240
10	1094128296
11	15096212664
12	206478042568
13	2844940947752
14	39196681965960
15	540088040101912
16	7448443982546312
17	102716411297423656
18	1416714539550709832

[0,2,50,136,2820,38000,421920,6118120,80521240, 1094128296,15096212664,206478042568,2844940947752, 39196681965960,540088040101912,7448443982546312, 102716411297423656,1416714539550709832]