A018968 - OEIS

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A018968 as a simple table

n	a(n)
2	3
3	7
4	41
5	184
6	802
7	4763
8	30995
9	198601
10	1284125
11	8389360
12	55733690
13	375706748
14	2554513453
15	17469639322
16	120124786243

[3,7,41,184,802,4763,30995,198601,1284125,8389360, 55733690,375706748,2554513453,17469639322, 120124786243]