A018969 - OEIS

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A018969 as a simple table

n	a(n)
2	3
3	7
4	41
5	185
6	828
7	4993
8	32018
9	201111
10	1281355
11	8331777
12	55434489
13	374585899
14	2549602441
15	17439189452
16	119906615481

[3,7,41,185,828,4993,32018,201111,1281355,8331777, 55434489,374585899,2549602441,17439189452, 119906615481]