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A291097 as a simple table

na(n)
23
38
420
547
6106
7233
8504
91079
102294
114853
1210228
1321491
1445042
1594193
16196592
17409583
18851950
191769453
203669996
217602155
2215728618
2332505833
2467108840
25138412007
26285212646
27587202533
281207959524
292483027939
305100273634
3110468982753
3221474836448
3344023414751

[3,8,20,47,106,233,504,1079,2294,4853,10228,21491,
 45042,94193,196592,409583,851950,1769453,3669996,
 7602155,15728618,32505833,67108840,138412007,
 285212646,587202533,1207959524,2483027939,
 5100273634,10468982753,21474836448,44023414751]