A098543 - OEIS

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A098543 as a simple table

n	a(n)
2	1
3	4
4	12
5	44
6	236
7	2028
8	29164
9	719340
10	30943724
11	2350770668
12	318680099308
13	77793540073964
14	34472347123476972
15	27928291976711924204
16	41631598900551078537708
17	114829789064202679162399212

[1,4,12,44,236,2028,29164,719340,30943724, 2350770668,318680099308,77793540073964, 34472347123476972,27928291976711924204, 41631598900551078537708, 114829789064202679162399212]