A135632 - OEIS

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A135632 as a simple table

n	a(n)
1	2
2	4
3	6
4	8
5	30
6	32
7	126
8	128
9	8190
10	8192
11	131070
12	131072
13	524286
14	524288
15	2147483646
16	2147483648
17	2305843009213693950
18	2305843009213693952
19	618970019642690137449562110
20	618970019642690137449562112

[2,4,6,8,30,32,126,128,8190,8192,131070,131072, 524286,524288,2147483646,2147483648, 2305843009213693950,2305843009213693952, 618970019642690137449562110, 618970019642690137449562112]