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A283852 as a simple table

na(n)
18
261
3409
42837
519776
6137459
7955680
86645662
946211001
10321328965
112234376733
1215536845232
13108036163039
14751234447860
155223743482218
1636323541679065
17252577425569649
181756308801126965
1912212574412144160
2084920700547463563

[8,61,409,2837,19776,137459,955680,6645662,
 46211001,321328965,2234376733,15536845232,
 108036163039,751234447860,5223743482218,
 36323541679065,252577425569649,1756308801126965,
 12212574412144160,84920700547463563]