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A304175 as a simple table

na(n)
11
21
32
45
512
627
759
8128
9277
10597
111280
122730
135794
1412248
1525836
1654508
17115222
18244144
19518104
201099499
212330326
224930089
2310415135
2421992400
2546470911
2698353146
27208580686
28443186181
29942988423
302007981801
314276830431
329109431322
3319404918449
3441357252072
3588236092543

[1,1,2,5,12,27,59,128,277,597,1280,2730,5794,
 12248,25836,54508,115222,244144,518104,1099499,
 2330326,4930089,10415135,21992400,46470911,
 98353146,208580686,443186181,942988423,2007981801,
 4276830431,9109431322,19404918449,41357252072,
 88236092543]