A018951 - OEIS

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A018951 as a simple table

n	a(n)
2	2
3	16
4	34
5	261
6	1054
7	7154
8	40978
9	273252
10	1750672
11	11774812
12	79284286
13	546309289
14	3803238482
15	26854369810
16	191472135408

[2,16,34,261,1054,7154,40978,273252,1750672, 11774812,79284286,546309289,3803238482, 26854369810,191472135408]