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A018031 as a simple table

na(n)
01
13
27
319
451
5135
6361
7963
82570
96859
1018303
1148839
12130321
13347749
14927933
152476099
166607227
1717630734
1847045881
19125537306
20334983955
21893871739
222385208822
236364695153
2416983563041
2545318967620
26120929207915
27322687697779
28861060384776
292297654950385

[1,3,7,19,51,135,361,963,2570,6859,18303,48839,
 130321,347749,927933,2476099,6607227,17630734,
 47045881,125537306,334983955,893871739,2385208822,
 6364695153,16983563041,45318967620,120929207915,
 322687697779,861060384776,2297654950385]