A270520 - OEIS

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A270520 as a simple table

n	a(n)
1	2
2	3
3	3
4	5
5	6
6	14
7	28
8	352
9	18574
10	44518346
11	400826881311158
12	25342673472297507115832358714
13	62130292590921086469117151395751018383242940308998211770

[2,3,3,5,6,14,28,352,18574,44518346, 400826881311158,25342673472297507115832358714, 62130292590921086469117151395751018383242940308998\ 211770]