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A300658 as a simple table

na(n)
14
26
38
428
532
636
778
884
9128
10168
11252
12496
13504
14532
15756
161488
172808
183720
194464
205928
218128
228192
2313392
2424384
2561236
2673152
2778120
28131072
29183708
30217728
31219456
32425880
33458640
34524288
351084752
361834560
372204280
383254256
396120432
406386688
4111007360

[4,6,8,28,32,36,78,84,128,168,252,496,504,532,756,
 1488,2808,3720,4464,5928,8128,8192,13392,24384,
 61236,73152,78120,131072,183708,217728,219456,
 425880,458640,524288,1084752,1834560,2204280,
 3254256,6120432,6386688,11007360]