A143702 - OEIS

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A143702 as a simple table

n	a(n)
1	2
2	6
3	14
4	30
5	30
6	42
7	30
8	78
9	182
10	1110
11	570
12	1830
13	6666
14	2310
15	2534
16	5538
17	9870
18	20010
19	141270
20	14070
21	480090
22	155490
23	334110
24	1794858
25	2463270
26	2132130
27	2349390

[2,6,14,30,30,42,30,78,182,1110,570,1830,6666, 2310,2534,5538,9870,20010,141270,14070,480090, 155490,334110,1794858,2463270,2132130,2349390]