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A015525 as a simple table

na(n)
00
11
23
317
475
5361
61683
77937
837275
9175321
10824163
113875057
1218218475
1385655881
14402715443
151893393377
168901903675
1741852858041
18196773803523
19925144274897
204349623252875
2120450023957801
2296147057896403

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