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A283021 as a simple table

na(n)
00
12
24
36
412
530
670
7168
8412
91014
102514
116270
1215702
1339468
1499516
15251586
16637500

[0,2,4,6,12,30,70,168,412,1014,2514,6270,15702,
 39468,99516,251586,637500]