A155325 - OEIS

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A155325 as a simple table

n	a(n)
5	1
6	7
7	19
8	37
9	133
10	535
11	2615
12	17641
13	119940
14	924944
15	8924108
16	102805254
17	1407633936
18	22958195053
19	437437783099

[1,7,19,37,133,535,2615,17641,119940,924944, 8924108,102805254,1407633936,22958195053, 437437783099]