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A140428 as a simple table

na(n)
00
11
21
33
45
59
615
727
849
991
10169
11317
12599
131143
142197
154251
168269
1716161
1831711
1962435
20123273
21243963
22483745
23960725
241910503
253803295
267577933
2715109499
2830143973
2960166553
30120136687
31239955563
32479396897
33957961755
341914577241

[0,1,1,3,5,9,15,27,49,91,169,317,599,1143,2197,
 4251,8269,16161,31711,62435,123273,243963,483745,
 960725,1910503,3803295,7577933,15109499,30143973,
 60166553,120136687,239955563,479396897,957961755,
 1914577241]