A091637 - OEIS

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A091637 as a simple table

n	a(n)
1	3
2	16
3	102
4	668
5	4715
6	34813
7	265015
8	2067152
9	16413535
10	132200223
11	1076692515
12	8849480283
13	73288053795
14	610860050965

[3,16,102,668,4715,34813,265015,2067152,16413535, 132200223,1076692515,8849480283,73288053795, 610860050965]