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A140456 as a simple table

na(n)
11
21
31
43
57
623
771
8255
9911
103535
1113903
1257663
13243871
141072031
154812575
1622278399
17105300287
18510764095
192527547455
2012794891007
2166012404863
22347599231103
231863520447103
2410178746224639
2556548686860543
26319628408814847
271835814213846271

[1,1,1,3,7,23,71,255,911,3535,13903,57663,243871,
 1072031,4812575,22278399,105300287,510764095,
 2527547455,12794891007,66012404863,347599231103,
 1863520447103,10178746224639,56548686860543,
 319628408814847,1835814213846271]