A126391 - OEIS

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A126391 as a simple table

n	a(n)
1	1
2	1
3	4
4	24
5	240
6	4320
7	146880
8	9694080
9	1260230400
10	325139443200
11	167121673804800
12	171466837323724800
13	351507016513635840000
14	1440475753672879672320000
15	11803258325595576034990080000

[1,1,4,24,240,4320,146880,9694080,1260230400, 325139443200,167121673804800,171466837323724800, 351507016513635840000,1440475753672879672320000, 11803258325595576034990080000]