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A228979 as a simple table

na(n)
12
216
3512
456472
520729216
625205141664
7102496979446048
81399175578116323192
964226272780209688718776

[2,16,512,56472,20729216,25205141664,
 102496979446048,1399175578116323192,
 64226272780209688718776]