A147363 - OEIS

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A147363 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	10
8	29
9	94
10	317
11	1198
12	6765
13	47364
14	374535
15	3411133
16	34790832
17	407506091
18	5940149025
19	105319233307
20	2203658353952
21	54294696366064
22	1560466368060039
23	52336543507272089

[1,1,1,1,1,3,10,29,94,317,1198,6765,47364,374535, 3411133,34790832,407506091,5940149025, 105319233307,2203658353952,54294696366064, 1560466368060039,52336543507272089]