A163158 - OEIS

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A163158 as a simple table

n	a(n)
1	2
2	7
3	23
4	167
5	439
6	3023
7	7919
8	54287
9	974167
10	2550407
11	32522920134767
12	3372041405099481407
13	9839618880490124200692486211717007
14	724995932728680612729658820311719934835368079

[2,7,23,167,439,3023,7919,54287,974167,2550407, 32522920134767,3372041405099481407, 9839618880490124200692486211717007, 724995932728680612729658820311719934835368079]