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A304947 as a simple table

na(n)
11
27
313
421
529
658
7120
8250
9515
101100
112302
124973
1310539
1422512
1548417
16103240
17222483
18476629
191023567
202201683
214721852
2210159934
2321815950
2446884155
25100796318
26216507106
27465528729
281000276465
292149938118
304621346273

[1,7,13,21,29,58,120,250,515,1100,2302,4973,10539,
 22512,48417,103240,222483,476629,1023567,2201683,
 4721852,10159934,21815950,46884155,100796318,
 216507106,465528729,1000276465,2149938118,
 4621346273]