A135961 - OEIS

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A135961 as a simple table

n	a(n)
0	1
1	1
2	2
3	3
4	5
5	10
6	25
7	79
8	318
9	1637
10	10753
11	89872
12	955537
13	12930173
14	222618066
15	4874855543
16	135781292309
17	4811103270054
18	216847500834513
19	12432143862756779
20	906625645142897790
21	84102571511631809865

[1,1,2,3,5,10,25,79,318,1637,10753,89872,955537, 12930173,222618066,4874855543,135781292309, 4811103270054,216847500834513,12432143862756779, 906625645142897790,84102571511631809865]