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A298880 as a simple table

na(n)
00
12
24
38
414
526
640
758
884
9114
10148
11194
12242
13306
14370
15454
16532
17624
18736
19848
20986
211120
221274
231438
241618
251800
261994
272220
282446
292700
302950
313222
323526
333830
344142
354516
364832
375214
385590
396020
406440
416860
427356
437830
448336
458816
469420
479934
4810532
4911118
5011740
5112396
5213022
5313702

[0,2,4,8,14,26,40,58,84,114,148,194,242,306,370,
 454,532,624,736,848,986,1120,1274,1438,1618,1800,
 1994,2220,2446,2700,2950,3222,3526,3830,4142,4516,
 4832,5214,5590,6020,6440,6860,7356,7830,8336,8816,
 9420,9934,10532,11118,11740,12396,13022,13702]