A138128 - OEIS

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A138128 as a simple table

n	a(n)
0	1
1	127
2	16129
3	2048383
4	260144641
5	33038369407
6	4195872914689
7	532875860165503
8	67675234241018881
9	8594754748609397887
10	1091533853073393531649
11	138624799340320978519423

[1,127,16129,2048383,260144641,33038369407, 4195872914689,532875860165503,67675234241018881, 8594754748609397887,1091533853073393531649, 138624799340320978519423]