A055084 - OEIS

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A055084 as a simple table

n	a(n)
1	1
2	15
3	180
4	2001
5	20755
6	200082
7	1781941
8	14637962
9	111011667
10	779695050
11	5093379110
12	31092553357
13	178203364143
14	963217652830
15	4930357535218
16	23989343505296
17	111335037107474
18	494383391324356
19	2106346854756098

[1,15,180,2001,20755,200082,1781941,14637962, 111011667,779695050,5093379110,31092553357, 178203364143,963217652830,4930357535218, 23989343505296,111335037107474,494383391324356, 2106346854756098]