A290051 - OEIS

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A290051 as a simple table

n	a(n)
1	6
2	2
3	294
4	2
5	126
6	112
7	310
8	14
9	150
10	840
11	3200
12	98
13	45360
14	10500
15	57120
16	40320
17	242250
18	9548
19	21839790
20	3756480
21	200425680
22	678810
23	1359540

[6,2,294,2,126,112,310,14,150,840,3200,98,45360, 10500,57120,40320,242250,9548,21839790,3756480, 200425680,678810,1359540]