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A305498 as a simple table

na(n)
12
24
36
410
516
624
736
854
982
10124
11186
12280
13420
14630
15946
161420
172130
183196
194794
207192
2110788
2216182
2324274
2436412
2554618
2681928
27122892
28184338
29276508
30414762
31622144
32933216
331399824
342099736
353149604
364724406
377086610
3810629916
3915944874
4023917312

[2,4,6,10,16,24,36,54,82,124,186,280,420,630,946,
 1420,2130,3196,4794,7192,10788,16182,24274,36412,
 54618,81928,122892,184338,276508,414762,622144,
 933216,1399824,2099736,3149604,4724406,7086610,
 10629916,15944874,23917312]