A018949 - OEIS

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A018949 as a simple table

n	a(n)
2	1
3	14
4	33
5	308
6	1356
7	9515
8	54475
9	357706
10	2245183
11	14782772
12	97279016
13	655110237
14	4458418304
15	30828999850
16	215762610377

[1,14,33,308,1356,9515,54475,357706,2245183, 14782772,97279016,655110237,4458418304, 30828999850,215762610377]