A037525 - OEIS

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A037525 as a simple table

n	a(n)
1	2
2	17
3	136
4	1090
5	8721
6	69768
7	558146
8	4465169
9	35721352
10	285770818
11	2286166545
12	18289332360
13	146314658882
14	1170517271057
15	9364138168456
16	74913105347650
17	599304842781201
18	4794438742249608

[2,17,136,1090,8721,69768,558146,4465169,35721352, 285770818,2286166545,18289332360,146314658882, 1170517271057,9364138168456,74913105347650, 599304842781201,4794438742249608]