A338057 - OEIS

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A338057 as a simple table

n	a(n)
1	1
2	6
3	15
4	35
5	1531513
6	2042057
7	3828689
8	4849879
9	5615321
10	8933993
11	9189469
12	14038957
13	16591609
14	17867867
15	20165077
16	20420417
17	28843849
18	31396331
19	34204153
20	37522621
21	43648643
22	82447517

[1,6,15,35,1531513,2042057,3828689,4849879, 5615321,8933993,9189469,14038957,16591609, 17867867,20165077,20420417,28843849,31396331, 34204153,37522621,43648643,82447517]