A217671 - OEIS

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A217671 as a simple table

n	a(n)
2	3
3	3
4	3
5	73
6	523
7	6581
8	10753
9	43103
10	43103
11	43103
12	55457
13	55457
14	28751773
15	278689963
16	278689963
17	784284211
18	4440915607
19	8340839629
20	30651695947
21	50246427391
22	50246427391

[3,3,3,73,523,6581,10753,43103,43103,43103,55457, 55457,28751773,278689963,278689963,784284211, 4440915607,8340839629,30651695947,50246427391, 50246427391]