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A007575 as a simple table

na(n)
01
13
27
319
453
5149
6419
71191
83403
99755
1028077
1181097
12234861
13681697
141982723
155777375
1616861521
1749281525
18144222987
19422566835
201239423303
213638872529
2210693065215
2331448140529
2492558787745
25272612601065
26803448576111

[1,3,7,19,53,149,419,1191,3403,9755,28077,81097,
 234861,681697,1982723,5777375,16861521,49281525,
 144222987,422566835,1239423303,3638872529,
 10693065215,31448140529,92558787745,272612601065,
 803448576111]