A186104 - OEIS

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A186104 as a simple table

n	a(n)
1	2
2	17
3	107
4	647
5	23327
6	139967
7	30233087
8	6530347007
9	39182082047
10	14215144014964850687
11	240614901699187213221099227578367
12	53193679461858262403856737876228196870083927814929645567

[2,17,107,647,23327,139967,30233087,6530347007, 39182082047,14215144014964850687, 240614901699187213221099227578367, 53193679461858262403856737876228196870083927814929\ 645567]