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A297064 as a simple table

na(n)
12
24
312
414
540
656
7112
8178
9306
10482
11792
121214
131924
142914
154470
166706
1710064
1814924
1922078
2032382
2147376
2268862
2399820
24144002
25207150
26296896
27424386
28604802
29859850
301219352
311725460
322436322
333433452
344829532
356781600
369506810
3713306606
3818597506
3925956060
4036177962

[2,4,12,14,40,56,112,178,306,482,792,1214,1924,
 2914,4470,6706,10064,14924,22078,32382,47376,
 68862,99820,144002,207150,296896,424386,604802,
 859850,1219352,1725460,2436322,3433452,4829532,
 6781600,9506810,13306606,18597506,25956060,
 36177962]