A015525 - OEIS

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A015525 as a simple table

n	a(n)
0	0
1	1
2	3
3	17
4	75
5	361
6	1683
7	7937
8	37275
9	175321
10	824163
11	3875057
12	18218475
13	85655881
14	402715443
15	1893393377
16	8901903675
17	41852858041
18	196773803523
19	925144274897
20	4349623252875
21	20450023957801
22	96147057896403

[0,1,3,17,75,361,1683,7937,37275,175321,824163, 3875057,18218475,85655881,402715443,1893393377, 8901903675,41852858041,196773803523,925144274897, 4349623252875,20450023957801,96147057896403]