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A053530 as a simple table

na(n)
01
10
21
33
47
535
6171
7847
85041
932643
10223705
111659581
1213182159
13110802133
14984241363
159212696235
1690477239521
17929604133343
189969157068273
19111329454692485
201291932988047775
2115550838026589061
22193833398512358011
232498039016973836491

[1,0,1,3,7,35,171,847,5041,32643,223705,1659581,
 13182159,110802133,984241363,9212696235,
 90477239521,929604133343,9969157068273,
 111329454692485,1291932988047775,
 15550838026589061,193833398512358011,
 2498039016973836491]