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A015448 as a simple table

na(n)
01
11
25
321
489
5377
61597
76765
828657
9121393
10514229
112178309
129227465
1339088169
14165580141
15701408733
162971215073
1712586269025
1853316291173
19225851433717
20956722026041
214052739537881
2217167680177565
2372723460248141
24308061521170129
251304969544928657
265527939700884757

[1,1,5,21,89,377,1597,6765,28657,121393,514229,
 2178309,9227465,39088169,165580141,701408733,
 2971215073,12586269025,53316291173,225851433717,
 956722026041,4052739537881,17167680177565,
 72723460248141,308061521170129,1304969544928657,
 5527939700884757]