A155405 - OEIS

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A155405 as a simple table

n	a(n)
5	1
6	7
7	19
8	37
9	61
10	179
11	1570
12	9884
13	43279
14	162911
15	1062503
16	13577598
17	173995382
18	1740580398
19	16367827293
20	223104829665
21	4754997792283
22	115851743032210

[1,7,19,37,61,179,1570,9884,43279,162911,1062503, 13577598,173995382,1740580398,16367827293, 223104829665,4754997792283,115851743032210]