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A268658 as a simple table

na(n)
12
28
318
466
5189
6209
7408
82208
92816
103168
113912
1220909
1354792
1459973
15157169
16303093
17709968
18801978
191832496
202145353
212291610
225082306
2310829346
2416408818

[2,8,18,66,189,209,408,2208,2816,3168,3912,20909,
 54792,59973,157169,303093,709968,801978,1832496,
 2145353,2291610,5082306,10829346,16408818]