A160476 - OEIS

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A160476 as a simple table

n	a(n)
2	1
3	10
4	210
5	420
6	4620
7	60060
8	60060
9	2042040
10	116396280
11	581981400
12	13385572200
13	13385572200
14	13385572200
15	388181593800
16	12033629407800
17	24067258815600
18	24067258815600
19	890488576177200
20	890488576177200

[1,10,210,420,4620,60060,60060,2042040,116396280, 581981400,13385572200,13385572200,13385572200, 388181593800,12033629407800,24067258815600, 24067258815600,890488576177200,890488576177200]