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A303036 as a simple table

na(n)
15
221
328
474
5197
6544
71686
85252
916336
1052895
11174633
12585706
132005396
146966921
1524490114
1686986183
17311425171
181121853996
194061084204
2014755768611
2153766216246
22196333300490
23718099046548
242629697794146
259638889966861

[5,21,28,74,197,544,1686,5252,16336,52895,174633,
 585706,2005396,6966921,24490114,86986183,
 311425171,1121853996,4061084204,14755768611,
 53766216246,196333300490,718099046548,
 2629697794146,9638889966861]