A018950 - OEIS

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A018950 as a simple table

n	a(n)
2	1
3	14
4	34
5	269
6	1202
7	7994
8	46169
9	303556
10	1940569
11	12977533
12	87080228
13	597278594
14	4140573533
15	29113967540
16	206824647665

[1,14,34,269,1202,7994,46169,303556,1940569, 12977533,87080228,597278594,4140573533, 29113967540,206824647665]