A093843 - OEIS

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A093843 as a simple table

n	a(n)
1	2
2	4
3	8
4	66
5	264
6	3740
7	22440
8	294525
9	2094400
10	33929280
11	277603200
12	14504767200
13	174057206400
14	4363862817600
15	57021140816640
16	1603719585468000
17	48300260456448000
18	729870602452992000
19	24200972607651840000

[2,4,8,66,264,3740,22440,294525,2094400,33929280, 277603200,14504767200,174057206400,4363862817600, 57021140816640,1603719585468000,48300260456448000, 729870602452992000,24200972607651840000]