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A224659 as a simple table

na(n)
13
212
350
4108
5260
6542
71126
82230
94336
108246
1115458
1228608
1352420
1495240
15171814
16308056
17549384
18975130
191723482
203034498
215324180
229311762
2316238070

[3,12,50,108,260,542,1126,2230,4336,8246,15458,
 28608,52420,95240,171814,308056,549384,975130,
 1723482,3034498,5324180,9311762,16238070]