A087164 - OEIS

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A087164 as a simple table

n	a(n)
1	1
2	2
3	3
4	7
5	23
6	91
7	383
8	1639
9	7043
10	30295
11	130343
12	560827
13	2413103
14	10383031
15	44675843
16	192230119
17	827123063
18	3558924955
19	15313255583

[1,2,3,7,23,91,383,1639,7043,30295,130343,560827, 2413103,10383031,44675843,192230119,827123063, 3558924955,15313255583]