A037557 - OEIS

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A037557 as a simple table

n	a(n)
1	2
2	17
3	137
4	1098
5	8785
6	70281
7	562250
8	4498001
9	35984009
10	287872074
11	2302976593
12	18423812745
13	147390501962
14	1179124015697
15	9432992125577
16	75463937004618
17	603711496036945
18	4829691968295561

[2,17,137,1098,8785,70281,562250,4498001,35984009, 287872074,2302976593,18423812745,147390501962, 1179124015697,9432992125577,75463937004618, 603711496036945,4829691968295561]