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A222785 as a simple table

na(n)
12
26
312
424
540
672
7126
8240
9648
102340
114320
127398
1317400
1427720
1549896
1693150
17196560

[2,6,12,24,40,72,126,240,648,2340,4320,7398,17400,
 27720,49896,93150,196560]