A147086 - OEIS

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A147086 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	5
8	13
9	33
10	133
11	443
12	1649
13	9331
14	62887
15	470664
16	4206245
17	41999179
18	473581733
19	6364226039
20	101605745953
21	1937023317718
22	43487285044885
23	1131769983108977

[1,1,1,1,1,1,5,13,33,133,443,1649,9331,62887, 470664,4206245,41999179,473581733,6364226039, 101605745953,1937023317718,43487285044885, 1131769983108977]