A155339 - OEIS

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A155339 as a simple table

n	a(n)
3	1
4	3
5	7
6	13
7	23
8	37
9	183
10	1053
11	5351
12	24397
13	99215
14	617661
15	5897471
16	64288141
17	714391583
18	7672307261
19	95370104207
20	1561595349917
21	31946273565055

[1,3,7,13,23,37,183,1053,5351,24397,99215,617661, 5897471,64288141,714391583,7672307261,95370104207, 1561595349917,31946273565055]