A018946 - OEIS

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A018946 as a simple table

n	a(n)
2	1
3	13
4	27
5	250
6	1027
7	7325
8	41828
9	286471
10	1880024
11	13073044
12	90717167
13	642317301
14	4569527100
15	32812863245
16	236942593847

[1,13,27,250,1027,7325,41828,286471,1880024, 13073044,90717167,642317301,4569527100, 32812863245,236942593847]