A189947 - OEIS

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A189947 as a simple table

n	a(n)
1	10
2	39
3	306
4	3247
5	31284
6	280284
7	2514945
8	23257218
9	219695998
10	2090461716
11	19931671853
12	190527865384
13	1828012347661
14	17602780129116
15	169999647974922
16	1645503998030853
17	15958170796668622
18	155032669862412399

[10,39,306,3247,31284,280284,2514945,23257218, 219695998,2090461716,19931671853,190527865384, 1828012347661,17602780129116,169999647974922, 1645503998030853,15958170796668622, 155032669862412399]