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A283568 as a simple table

na(n)
12
272
3674
46812
560802
6528436
74441052
836589848
9296555892
102373574616
1118804085974
12147722885964
131152326125736
148934988081564
1568923216977218
16529275667161388
174048382091614590
1830857555674174468
19234469910144650842

[2,72,674,6812,60802,528436,4441052,36589848,
 296555892,2373574616,18804085974,147722885964,
 1152326125736,8934988081564,68923216977218,
 529275667161388,4048382091614590,
 30857555674174468,234469910144650842]