A139019 - OEIS

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A139019 as a simple table

n	a(n)
1	1
2	2
3	5
4	11
5	13
6	17
7	79
8	83
9	33554221
10	33554501
11	2198956146619
12	2198956147781
13	9002801275337659
14	9002801275339331

[1,2,5,11,13,17,79,83,33554221,33554501, 2198956146619,2198956147781,9002801275337659, 9002801275339331]