A155411 - OEIS

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A155411 as a simple table

n	a(n)
5	1
6	7
7	19
8	37
9	76
10	258
11	1393
12	9223
13	50174
14	277825
15	1912295
16	17811734
17	207588822
18	2624271308
19	35563828726
20	553613643453

[1,7,19,37,76,258,1393,9223,50174,277825,1912295, 17811734,207588822,2624271308,35563828726, 553613643453]