A153013 - OEIS

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A153013 as a simple table

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	9
8	10
9	15
10	16
11	11
12	12
13	25
14	50
15	147
16	220
17	6125
18	1968750
19	89142864525
20	84252896510182189218
21	34892570216750728458698250328871491829901861750593684043

[0,1,2,3,4,5,6,9,10,15,16,11,12,25,50,147,220, 6125,1968750,89142864525,84252896510182189218, 34892570216750728458698250328871491829901861750593\ 684043]