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A001892 as a simple table

na(n)
21
32
45
515
649
7169
8602
92191
108095
1130239
12113906
13431886
141646177
156301715
1624210652
1793299841
18360490592
191396030396
205417028610
2121056764914
2281978913225
23319610939055
241247641114021
254875896455975
2619075294462185
2774696636715792
28292758662041150

[1,2,5,15,49,169,602,2191,8095,30239,113906,
 431886,1646177,6301715,24210652,93299841,
 360490592,1396030396,5417028610,21056764914,
 81978913225,319610939055,1247641114021,
 4875896455975,19075294462185,74696636715792,
 292758662041150]