A123481 - OEIS

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A123481 as a simple table

n	a(n)
1	2
2	3
3	7
4	9
5	27
6	230631
7	626331
8	837799
9	1723519
10	3732423
11	6649279
12	8400511
13	63728127
14	3743559068799
15	100759293214567
16	104899295810901231

[2,3,7,9,27,230631,626331,837799,1723519,3732423, 6649279,8400511,63728127,3743559068799, 100759293214567,104899295810901231]