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A281874 as a simple table

na(n)
01
11
21
33
45
513
631
771
8181
9447
101111
112799
127083
1317939
1445563
15115997
16295827
17755275
181929917
194935701
2012631111
2132340473
2282837041
23212248769
24543978897
251394481417
263575356033
279168277483
2823512924909
2960306860253
30154689354527
31396809130463

[1,1,1,3,5,13,31,71,181,447,1111,2799,7083,17939,
 45563,115997,295827,755275,1929917,4935701,
 12631111,32340473,82837041,212248769,543978897,
 1394481417,3575356033,9168277483,23512924909,
 60306860253,154689354527,396809130463]